Given the task definition and input, reply with output. In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.

In its campaign across northern Syria and Iraq, the jihadist group Islamic State has been using ammunition from the United States and other countries that have been supporting the regional security forces fighting the group, according to new field data gathered by a private arms-tracking organization. 
  
 The data, part of a larger sample of captured arms and cartridges in Syria and Iraq, carries an implicit warning for policy makers and advocates of intervention. 
  
 It suggests that ammunition transferred into Syria and Iraq to help stabilize governments has instead passed from the governments to the jihadists, helping to fuel the Islamic State’s rise and persistent combat power. Rifle cartridges from the United States, the sample shows, have played a significant role. 
  
 “The lesson learned here is that the defense and security forces that have been supplied ammunition by external nations really don’t have the capacity to maintain custody of that ammunition,” said James Bevan, director of Conflict Armament Research, the organization that is gathering and analyzing weapons used by the Islamic State. ||||| US-led air strikes in northern Syria have failed to interrupt the advance of Islamic State (Isis) fighters closing in on a key city on the Turkish border, raising questions about the western strategy for defeating the jihadi movement. 
  
 Almost two weeks after the Pentagon extended its aerial campaign from Iraq to neighbouring Syria in an attempt to take on Isis militants in their desert strongholds, Kurdish fighters said the bombing campaign was having little impact in driving them back. 
  
 Isis units have edged to within two kilometres of the centre of Kobani, according to Kurds fighting a rearguard action inside the city. The jihadis, who this weekend generated further outrage with the murder of the British hostage Alan Henning, are simply too numerous to be cowed by the air assault by US fighter jets, the Kurds say. 
  
 “Air strikes alone are really not enough to defeat Isis in Kobani,” said Idris Nassan, a senior spokesman for the Kurdish fighters desperately trying to defend the important strategic redoubt from the advancing militants. “They are besieging the city on three sides, and fighter jets simply cannot hit each and every Isis fighter on the ground.” 
  
 He said Isis had adapted its tactics to military strikes from the air. “Each time a jet approaches, they leave their open positions, they scatter and hide. What we really need is ground support. We need heavy weapons and ammunition in order to fend them off and defeat them.” 
  
 The Britain-based Syrian Observatory for Human Rights has reported that warplanes have carried out repeated strikes in recent nights around Kobani. The Pentagon has reported daily on its aerial missions over Iraq and Syria since first deciding to go after Isis two months ago. But it does not pinpoint exact locations. “Two strikes north-west of Raqqa struck a large (Isis) unit and destroyed six firing positions,” it said on Sunday in a statement. Kobani is north-west of Raqqa. 
  
 But the claim that the aerial bombardment is not sufficient to turn the tide on the ground will unsettle those in the US-led coalition, including the UK government, who have signed up to an air war as the best way of taking the fight to Isis. 
  
 In Washington, military hawks continue to argue for an escalation of the war in Syria and Iraq with the deployment of US ground troops – a move that Barack Obama has repeatedly ruled out. 
  
 “The strategy of aerial bombardment is not going to work to destroy Isil [Isis],” the South Carolina senator Lindsey Graham told CNN. “You cannot destroy Isil without a ground component.” He argued that training the inexperienced fighters of the Free Syrian Army in Saudi Arabia was “militarily unsound” and “will lead to their slaughter”. 
  
 His words were echoed in London by the former chief of the defence staff General Sir David Richards. “Air power alone will not win a campaign like this,” he told BBC1’s Andrew Marr Show. “It isn’t actually a counter-terrorist operation. This is a conventional enemy in that it has armour, tanks, artillery … it is quite wealthy, it holds ground and it is going to fight. So therefore you have to view it as a conventional military campaign.” 
  
 Nick Clegg, the deputy prime minister, disagreed. “How you respond is not quite as straightforward as David Richards, much as I respect him, suggests,” he said. “I don’t think it is a question of simply ramping up conventional armed forces again as if we were fighting state-to-state conflicts.” 
  
 Clegg said states would cooperate in a “jigsaw” operation in which different countries bring different capabilities against “stateless mobile troops”. But Britain has thus far committed only to air strikes over Iraq, and Clegg said he was opposed to stepping up the British action. “I wouldn’t advocate extending the air campaign into Syria which is why we didn’t do it last week,” he said. The prime minister, 
  
 David Cameron, will not propose a vote on Syrian air strikes unless the Lib Dems and Labour agree. 
  
 But appetite to confront Isis remains undiminished in the light of the grim succession of the murders of hostages. Cameron vowed at the weekend to use “all the assets we have” to secure justice for Henning, whose murder was broadcast online on Friday night, making him the fourth captive to be killed in six weeks. Isis has threatened to kill an American aid worker, Peter Kassig, next. 
  
 Kobani has emerged as the most important flashpoint between Kurds and jihadists in Syria because of the strategic importance of the city and the sheer numbers of Kurds who sought refuge there in recent months. More than 160,000 have fled to Turkey in the face of the Isis advance, sharply aggravating historic tensions between Turks and Kurds. On Sunday, a stray shell hit a village on the Turkish side of the border, injuring five people. 
  
 MPs and representatives of Kurdish groups in Turkey arrived at the border to show solidarity with Syrian Kurds and to form a “human chain” stretching along villages bordering Kobani. Meanwhile, Saleh Muslim, co-chair of the Syrian Kurdish Democratic Union party (PYD), went to Ankara this weekend to hold meetings with Turkish security officials to discuss possible Turkish assistance in defending Kobani against Isis. Turkey’s government has vowed it will not sit idly by and let Kobani fall. 
  
 Turkish media reported that security officials in Ankara urged Muslim to convince the YPG, the armed wing of the PYD that is currently battling Isis in Kobani, to join the ranks of the Free Syrian Army (FSA) and to “take an open stance against the Syrian regime” of Bashar al-Assad. 
  
 “We are calling on the international community to help us defend Kobani,” said Nassan. 
  
 He said the exact outcome of the meetings remained unclear, but hinted that Muslim had asked Ankara to allow for the PYD, the Syrian Kurdish affiliate of the better-known Kurdistan Workers’ party (PKK), to receive arms from outside of Syria. 
  
 “If Isis takes Kobani, they will be right on the border with Turkey. This concerns not only us, but Turkey, too.” ||||| Story highlights Source says "It's the last chance to leave" for Kobani defenders 
  
 ISIS fighters have taken part of a strategic hill near Kobani, sources say 
  
 ISIS fighters have entered the southeastern edge of the city, the sources said 
  
 Pakistani Taliban issues statement supporting ISIS 
  
 ISIS moved closer to seizing Kobani on Sunday as militants entered the southeastern edge of the Syrian city and street-to-street fighting began, a fighter and a media activist inside the city told CNN. 
  
 The city's defenders were looking for ways to escape the Kurdish stronghold strategically located near the Turkish border, the fighter said. 
  
 "It's the last chance to leave," the fighter said. The fighter and media activist requested their names be withheld for security reasons. 
  
 As night fell, the city grew quiet. 
  
 Members of the Kurdish People's Protection Unit, called YPG, and other groups defending the city were unable to move because ISIS snipers were equipped with night vision equipment, the fighter said. 
  
 The fighter said many city defenders close to the Turkish border attempted to cross into Turkey, while other fighters closer to ISIS positions were waiting until the morning to make a move. 
  
 The importance of Kobani 
  
 ISIS has been trying to seize Kobani for weeks. The city is significant because ISIS wants to claim a swath of land running from its self-declared capital of Raqqa, Syria, on the Euphrates River to the Turkish border, more than 60 miles away. 
  
 On Sunday, ISIS fighters overpowered Kurdish forces to take the top and the eastern side of Meshta Nour, the strategic hill overlooking Kobani, said the sources, who both requested their names be withheld for security reasons. 
  
 A civilian source inside Kobani said there have been heavy clashes on all fronts around Kobani. He said ISIS forces had been moved back from a small corner of the city they'd held for two days. 
  
 The YPG said in a statement that 86 "terrorists" were killed during a 24-hour period and 17 YPG members died. 
  
 On Sunday, smoke billowed over Kobani as ISIS sent bombs into the middle of town. 
  
 U.S., allies stage airstrikes 
  
 Kobani is now tightly surrounded in a crescent from the Aleppo road on the southwestern outskirts of the city all the way to the eastern edge of Kobani, near the Turkish border, the fighter and media activist said. 
  
 ISIS is making inroads despite airstrikes by U.S. and allied forces, including Sunday's strikes on the eastern outskirts of the city. 
  
 The YPG destroyed an ISIS tank in the east of Kobani near Kane Kordan, a large mound on the eastern of the city, the civilian source said. 
  
 ISIS fighters are now about about one kilometer south on the Aleppo road, the civilian source said. 
  
 Turkish security force throw teargas 
  
 Conflict occurred outside Kobani when Turkish security forces fired tear gas canisters at Kurds gathered near the border to watch the fighting from afar, CNN's Phil Black reported. 
  
 Black said the security forces fired the tear gas when the crowds became restive or moved too close to the border. At least three canisters struck a CNN van, he said. Nobody was badly hurt and the crowds dispersed. 
  
 Pakistani Talilban supports ISIS 
  
 ISIS picked up support when Pakistani Taliban spokesperson Shahidullah Shahid issued a statement backing ISIS. 
  
 "The Muslims of the world look to you with great expectation and in this difficult time we your mujahidin brothers are with you and will provide you with fighters and help," the statement said. 
  
 Meanwhile, U.S. and allied military forces conducted three airstrikes against ISIS in Syria and six airstrikes in Iraq on Saturday and Sunday, U.S. Central Command reported. 
  
 In Syria, one strike northwest of Al Mayadin destroyed an ISIS bulldozer, two tanks and another vehicle, the military said. Two strikes northwest of Ar Raqqah hit a large ISIS unit and destroyed six firing positions. 
  
 In Iraq, four strikes northeast of Fallujah struck two mortar teams, a large ISIS unit and two small ISIS units, the military said. Three ISIS Humvees were destroyed with strikes near Hit and Sinjar. 
  
 Australians complete first air mission 
  
 Australia has completed its first air combat mission over Iraq, the government announced Sunday in a press release. 
  
 Two Royal Australian Air Force F/A-18F Super Hornet aircraft conducted an air interdiction and close air support mission over northern Iraq and were on-call to attack targets if needed, the release said. 
  
 The aircraft did not use their munitions and returned to base to disarm, the release said. |||||

The start of a new week brings not much in the way of encouraging ISIS news. The latest: The news: Kurdish fighters battling ISIS in northern Syria say the airstrikes aimed at the militants there haven't done much to stop the group's advance on Kobani. Kurds put ISIS' position as within roughly a mile of the center of the city, which sits along the Turkish border. A rep for the Kurds explains to the Guardian that upon the approach of a jet, the fighters "scatter and hide. ... Fighter jets simply cannot hit each and every ISIS fighter on the ground." Though the Pentagon shares no specifics about strike locations, the Syrian Observatory for Human Rights reports that the areas around Kobani have been continually hit in recent days. The significance: The Guardian sees the Kurds' assertion as one that will "unsettle those in the US-led coalition ... who have signed up to an air war as the best way of taking the fight to ISIS." As for why Kobani matters, it falls within the stretch of land that ISIS seeks to claim between its "capital" of Raqqa and the border with Turkey, notes CNN. The news: The New York Times today reports on what ISIS fighters are using to wage their battle: ammunition from America and other enemy nations of ISIS. The finding comes from Conflict Armament Research's analysis of 1,730 cartridges found in Syria and Iraq—either sized by Kurdish fighters or gathered by CAR investigators. In the former country, most of the seized cartridges were manufactured in the 1970s and 1980s, most commonly in China. The cartridges found in Iraq were mostly of US origin, and manufactured in the 2000s. More than 80% of the ammunition was made in the US, China, post-Soviet Russia, and Serbia. The significance: Per the Times, the data "carries an implicit warning for policy makers and advocates of intervention. It suggests that ammunition transferred into Syria and Iraq to help stabilize governments has instead passed from the governments to the jihadists." Also, the parents of an American ISIS hostage released a letter he wrote to them.