Teacher:In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.
Teacher: Now, understand the problem? Solve this instance: Family members of Hannah Witheridge, one of two slain British tourists, cry at the Royal Thai Police Headquarters before meeting with Thai police in Bangkok, Thailand, Thursday, Sept. 18, 2014. Police... (Associated Press) 
  
 Family members of Hannah Witheridge, one of two slain British tourists, cry at the Royal Thai Police Headquarters before meeting with Thai police in Bangkok, Thailand, Thursday, Sept. 18, 2014. Police... (Associated Press) 
  
 BANGKOK (AP) — Thailand's military ruler apologized Thursday for suggesting that foreigners visiting the country's world-famous beaches might be unsafe wearing bikinis in the wake of the killing of two British tourists this week. 
  
 The bodies of the man and woman were found bludgeoned on the scenic resort island of Koh Tao on Monday, dealing another blow to a tourist industry which has been struggling to recover since the army seized power in May. 
  
 Gen. Prayuth Chan-ocha's comments Wednesday triggered an uproar on social media and one British tabloid, the Daily Mail, ran a front-page headline accusing him of "Smearing ... Britons Murdered in Paradise." 
  
 Prayuth had said that foreigners visiting the Southeast Asian country think "they can do whatever they want, wear bikinis wherever they like ... (but) will they be safe?" 
  
 On Thursday, however, he backtracked. 
  
 "I apologize that I have spoken too harshly ... I didn't mean to criticize or look down on anyone. Today I can guarantee that Thailand is still safe ... I wanted to warn (the tourists) to be careful," he said. 
  
 Although Thailand is infamous worldwide as a freewheeling hub of sex tourism, its culture is fairly conservative with many Thai women preferring to don shorts rather than bikinis on the beach. 
  
 The killings of the two Britons remain unsolved and no arrests have been made. ||||| Image copyright Family photos Image caption Ms Witheridge and Mr Miller were found close to the bungalows where they had been staying 
  
 Thai police admit they are struggling to find the killers of two British tourists, after it emerged crime scene DNA did not match that of any suspect. 
  
 Hannah Witheridge, 23, and David Miller, 24, were found dead on a beach on the island of Koh Tao on Monday. 
  
 British brothers Christopher and James Ware were questioned but police now say there is no evidence against them. 
  
 Officers had said there was "strong evidence" against Burmese suspects, but now say there are no DNA matches. 
  
 Forensic tests carried out on Ms Witheridge's body revealed traces of semen from two different men, neither of which matched DNA from Mr Miller, the Ware brothers or 11 Burmese people they have been questioning. 
  
 Media playback is unsupported on your device Media caption The BBC's Jonathan Head says Koh Tao is an island in shock 
  
 Meanwhile, Thailand's prime minister has apologised after he appeared to suggest beautiful women in bikinis could not be safe. 
  
 'Not much progress' 
  
 BBC south-east Asia correspondent Jonathan Head said police have admitted they "really don't know where to look now". 
  
 He said investigators had several problems, including that the crime scene was not sealed off and people were not stopped from leaving Koh Tao after the killings. 
  
 "The impression we got from a police press conference [on Thursday] was they haven't really made much progress at all," he added. 
  
 He said police were looking for a group of men who were heard singing "Western pop songs" near the crime scene. 
  
 Image copyright AFP Image caption Police were still gathering evidence on Wednesday - but the area was not closed off after the killings 
  
 Image copyright ALAMY Image caption Koh Tao is a popular holiday destination but is less developed than some neighbouring islands 
  
 Post-mortem examinations showed Ms Witheridge, from Hemsby in Norfolk, died from head wounds and Mr Miller, from Jersey, died from severe blows to the head and drowning. 
  
 Police said Mr Miller also suffered wounds on his hands, which indicated a struggle had taken place. 
  
 Their bodies were found close to the beach-side bungalows where they had been staying. A garden hoe believed to have been used in the attack was found nearby. 
  
 Members of Ms Witheridge's family have arrived in Bangkok and had a meeting with Thailand's deputy police chief. 
  
 British consul Michael Hancock said they were "deeply distressed" and it was "very important for the family" to speak directly to a senior police officer. 
  
 Koh Tao 
  
 Small island covering eight sq miles (21 sq km) north of Koh Samui and Koh Phangan in Gulf of Thailand 
  
 Population of about 2,100 and visited by between 400,000 and 500,000 travellers per year 
  
 Popular with backpackers and divers 
  
 Quieter and less developed than neighbouring islands which are known for nightlife and beach parties 
  
 Thailand's paradise island murder mystery 
  
 The Ware brothers, believed to be from Jersey, were stopped at Bangkok International Airport as they prepared to leave the country. 
  
 Police earlier said they were "possible suspects" but did not arrest them. Formally making people suspects is an official judicial process in Thailand. 
  
 The BBC understands they have now been told they can leave Thailand. 
  
 Image copyright AFP Image caption Mr Miller and Ms Witheridge were staying at Ocean View Bungalows on Koh Tao 
  
 Image copyright AFP Image caption British consul Michael Hancock said Ms Witheridge's family were "deeply distressed" 
  
 Image copyright ALAMY Image caption Koh Tao attracts hundreds of thousands of tourists every year 
  
 British freelance journalist Andrew Drummond, who lives in Bangkok, said the investigation seemed to have followed the "same pattern" as those into previous killings of Britons in Thailand, such as the unsolved murder of Kirsty Jones in 2000. 
  
 "Police initially seem to always seek the foreigners or the immigrants as the main suspects and that certainly happened in this case," he said. 
  
 "We've had a week of toing and froing between British suspects and Burmese immigrant suspects and now we find out that... the DNA doesn't match anybody." 
  
 Bikinis remark 
  
 Speaking earlier this week, Thailand's prime minister appeared to suggest attractive women put themselves in danger by wearing certain clothes. 
  
 "Can they be safe in bikinis... unless they are not beautiful?" he said. 
  
 General Prayuth Chan-ocha, who led a military coup in May, has since said: "I'm sorry that it [the comment] hurt people." 
  
 Ms Witheridge's family described her as "a beautiful, intelligent, loving young woman who poured joy into the lives of all who knew her". 
  
 In a statement, Mr Miller's family said he was "hard-working, bright and conscientious, with everything to look forward to". ||||| Residents of Koh Tao offer prayers on Thursday for the two British tourists slain on the island. 
  
 The search for the killers of two British tourists on Koh Tao has focussed on two men who shared a cigarette and whose semen was found on the murdered woman's body. 
  
 Locals hold a religious ceremony for the two murdered British tourists at a pavilion on Sai Ree beach, Koh Tao , in Surat Thani's Phangan district on Thursday. (Video by Thiti Wannamontha) 
  
 Tests on DNA samples collected from the body of Hannah Victoria Witheridge, 24, did not match samples taken from the other victim, David William Miller, 24, or Christopher Alan Ware, Miller's friend, or the six Myanmar workers earlier suspected. 
  
 The semen DNA matched DNA found on the butt of an LM cigarette found beside a rock 30-50 metres from the crime scene, Surat Thani police chief Kiattipong Khaosam-ang said on Thursday. 
  
 He said the DNA of two men was found on the cigarette butt and they matched the DNA found in the semen found inside the female victim's body. 
  
 Pol Maj Gen Kiattipong said it seemed the two men had shared a cigarette about the time Miller and Witheridge had walked past them, heading to the sandy area of the beach where they were murdered. 
  
 A hoe from a nearby vegetable garden had been used in the murder, he said. 
  
 Forensic export Pol Gen Jarumporn Suramanee, right, collects evidence at the crime scene on Koh Tao on Thursday. (Photo by Thiti Wannamontha) 
  
 Police still thought that foreign workers on Koh Tao, especially Rohingya, were the most likely suspects, but had not ruled out Thais visiting or living on Koh Tao, or foreign tourists, the Surat Thani police chief said. 
  
 The murderers might have used two weapons. The blood on the hoe was from Witheridge alone, Pol Maj Gen Kiattipong said. The other weapon was likely to be a metal object used to bludgeon Miller. 
  
 Investigators had combed the beach nearby the crime scene where there was a party that both victims attended, in the search for more evidence. 
  
 Staff of the British embassy took Miller's friend, Mr Ware, from police custody and put him and his younger brother on a flight to England on Thursday, tourist police commander Apichai Thiamataya said. Consular staff promised that if Thai police needed more information the British embassy would contact them. 
  
 Mr Ware's younger brother had left Koh Tao in Phangan district of Surat Thani province for Bangkok before the murder, so he was cleared, Pol Maj Apichai said. 
  
 Although Mr Ware had an injury on the back of his hand, there was a medical certificate to confirm that it was caused by a firework, he said. 
  
 It was reported that staff of the British embassy had arranged for the release of the two murder victims' bodies from the Institute of Forensic Medicine at the Police General Hospital in Bangkok on Wednesday evening for transport back to their homes. 
  
 British consul Michael Hancock took members of the victims' families to meet Royal Thai Police adviser Jarumporn Suramanee for a briefing on the results of the autopsies on the bodies and an update on the progress in the investigation. 
  
 The family members were too upset to give interviews to reporters. 
  
 Pol Gen Jarumporn said that the victims' family members had no questions about the results of the autopsies, but had asked that reporters consider their feelings. 
  
 The two tourists were found slain on Sai Ree beach of Koh Tao early Monday morning. 
  
 About 100 local people on Koh Tao attended a religious rite and made merit for the victims on the tourist island on Thursday. 
  
 At the ceremony, Koh Tao mayor Chaiyant Thurasakul said local people felt a deep sadness because there had never been such a murder on the island before. 
  
 He said Koh Tao municipality and local business operators would improve security for tourists and install lights and surveillance cameras in risk areas. |||||
Student:
DNA tests have thrown Thai authorities a goose egg in their quest to solve the savage murders of two British tourists. Semen from two different men was found on the body of 23-year-old Hannah Witheridge, reports the BBC, but analysis revealed that while both sets matched DNA pulled from a cigarette butt found nearby—indicating that the suspects shared a smoke, notes the Bangkok Post—neither was a match for fellow victim David Miller, 24; his British roommate; or 11 Burmese migrants who had been questioned. With all suspects eliminated, the BBC's correspondent says police "really don't know where to look now. The impression we got from a police press conference [today] was they haven't really made much progress at all." A Briton who lives in Bangkok tells the BBC that the targeting of "foreigners or the immigrants" by police mirrors how police reacted to a similar slaying of a British woman in 2000. "We've had a week of toing and froing between British suspects and Burmese immigrant suspects and now we find out that ... the DNA doesn't match anybody," he says. Meanwhile, the AP notes that Thai PM Gen. Prayuth Chan-ocha has walked back his statement that beautiful people in bikinis should have no expectation of safety, saying today he had "spoken too harshly. I didn't mean to criticize or look down on anyone."