Definition: In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.
Input: The Philippines' most active volcano ejected a huge column of lava fragments, ash and smoke in a thunderous explosion Monday, sending thousands of villagers back to evacuation centers and prompting a warning that a violent eruption may be imminent. 
  
 The midday explosion sent superheated lava, molten rocks and steam between 3.5 to 5 kilometers (2 to 3 miles) into the blue sky, and then some cascaded down Mount Mayon's slopes and shrouded nearby villages in darkness, Renato Solidum of the Philippine Institute of Seismology and Volcanology and other officials said. 
  
 From the crater, the deadly debris billowed about three kilometers (1.8 miles) down on the southern plank of Mayon toward a no-entry danger zone. There were no immediate reports of deaths or injuries, officials said. 
  
 The Associated Press 
  
 The explosion was the most powerful since the volcano started acting up more than a week ago. 
  
 Due to its relatively gentle eruption last week, thousands left emergency shelters and returned to their communities in Legazpi city outside the danger zone. But Monday's blast sent nearly 12,000 fleeing back to evacuation centers, raising the number of people in those shelters to more than 30,000, Yucot said. 
  
 Authorities on Monday raised the alert level to four on a scale of five, which means an explosive eruption is possible within hours or days. A danger zone around Mayon was expanded to 8 kilometers (5 miles) from the crater, which means thousands of villagers will have to leave their homes, officials said. 
  
 The Associated Press 
  
 Airplanes were ordered to stay away from the crater and ash-laden winds and several flights were canceled. 
  
 Volcanic ash fell in about a dozen towns in coconut-growing Albay province, where Mayon lies, and in nearby Camarines Sur province, with visibility being heavily obscured in a few towns because of the thick gray ash fall, Jukes Nunez, an Albay provincial disaster response officer, said by telephone. 
  
 "It was like night time at noon, there was zero visibility in some areas because the ash fall was so thick," Nunez said. 
  
 More than 30,000 ash masks and about 5,000 sacks of rice, along with medicine, water and other supplies, were being sent to evacuation centers, Office of Civil Defense regional director Claudio Yucot said. 
  
 Mayon lies about 340 kilometers (210 miles) southeast of Manila. With its near-perfect cone, it is popular with climbers and tourists but has erupted about 50 times in the last 500 years, sometimes violently. 
  
 In 2013, an ash eruption killed five climbers who had ventured near the summit despite warnings. Mayon's first recorded eruption was in 1616 and the most destructive, in 1814, killed more than 1,200 people and buried the town of Cagsawa in volcanic mud. The belfry of Cagsawa's stone church still juts out from the ground in an eerie reminder of Mayon's fury. 
  
 The Philippines lies in the "Ring of Fire," a line of seismic faults surrounding the Pacific Ocean where earthquakes and volcanic activity are common. 
  
 In 1991, Mount Pinatubo in the northern Philippines exploded in one of the biggest volcanic eruptions of the 20th century, killing about 800 people. ||||| (CNN) Authorities in the Philippines are warning people to stay clear of the volatile Mount Mayon volcano after multiple eruptions overnight spread lava and ash for kilometers. 
  
 A thick column of ash streamed five kilometers into the air above the volcano, in Albay province in southeastern Luzon, and spread over neighboring districts, the Philippine Institute of Volcanology and Seismology (PHIVOLCS) said in a statement Tuesday. 
  
 Falling ash left Guinobatan, a town of around 80,000 people, in a state of "zero visibility," according to affiliate CNN Philippines. 
  
 LOOK: Zero visibility in Guinobatan town, Albay due to heavy ashfall after #MayonVolcano explosion https://t.co/gs7NTo1uFU 
  
  
  
 📸: Vince Casilihan pic.twitter.com/cYt86ypiEl — CNN Philippines (@cnnphilippines) January 22, 2018 
  
 PHIVOLCS said it had also detected "two explosion-type earthquakes" as well as dozens of rockfalls and "lava fountaining episodes" in and around the crater on Monday. 
  
 The alert level for Mayon volcano -- the country's most active volcano -- was raised to four from three last week after it exhibited increasing seismic unrest and summit explosions. The highest level -- five -- means a hazardous eruption is underway. 
  
 Read More ||||| Update: Jan. 24, 10:35 a.m. EST — Between yesterday morning and this morning (Jan. 24), the Mayon volcano has launched five intense lava fountains from the summit crater, with these events lasting from 7 minutes to an hour and 24 minutes, according to the Philippine Institute of Volcanology and Seismology (PHIVOLCS). The fountains shot up 1,640 to 2,000 feet (500 to 600 meters) above the crater and generated ash plumes that were up to 3 miles (3 to 5 kilometers) high. Alert Level 4 remains in effect over the volcano. "The public is strongly advised to be vigilant and desist from entering the eight (8) kilometer-radius [5 miles] danger zone, and to be additionally vigilant against pyroclastic density currents, lahars [fast-moving volcanic flows] and sediment-laden streamflows along channels draining the edifice. Civil aviation authorities must also advise pilots to avoid flying close to the volcano’s summit as ash from any sudden eruption can be hazardous to aircraft." 
  
 --- 
  
 Explosions shook the Mayon volcano, while fountains of lava spewed from its summit today (Jan. 22), causing the Philippines government to raise the hazard level from 3 to 4, indicating a violent eruption is imminent. 
  
 "Because of this, the Danger Zone is extended to an 8-kilometer [5 miles] radius from the summit vent. The public is strongly advised to be vigilant and desist from entering this danger zone," the Philippine Institute of Volcanology and Seismology (PHIVOLCS) said in a statement. "Civil aviation authorities must also advise pilots to avoid flying close to the volcano's summit as ash from eruptions can be hazardous to aircraft." 
  
 A giant mushroom-shaped cloud rises into the air from the Mayon volcano, seen from the highway in the town of Camalig, near Legazpi City in Albay province, south of Manila on Jan. 22, 2018. Credit: AFP/Getty 
  
 The ground around the summit has also been shaking, PHIVOLCS said. [5 Colossal Cones: Biggest Volcanoes on Earth] 
  
 Renato Solidum of PHIVOLCS and other officials said that the explosion, which occurred around noon local time, "sent superheated lava, molten rocks and steam cascading down Mount Mayon's slopes and shrouded nearby villages in darkness," the Guardian reported. 
  
 More than 27,000 residents in Albay Province have fled since Mayon began erupting a few weeks ago, according to the Guardian report. Just last week, an eruption sent red-hot lava from the volcano's mouth, so much that it gave the mountain a face-lift of sorts — the lava repaired damage to the southern side of the volcano from previous eruptions, restoring its iconic cone shape. 
  
 The Mayon volcano — which rises some 8,077 feet (2,462 meters) above the Albay Gulf — is the Philippines most active volcano, according to the U.S. Geological Society (USGS). Its steep upper slopes make it a popular, albeit dangerous, climbing spot. 
  
 In 2013, with no warning, the volcano burst to life in a so-called phreatic explosion, due to water seeping into the volcano's magma chamber and blasting out as steam. The explosion killed five climbers and injured seven. After several climbing fatalities on Mayon in the 1990s, the International Association of Volcanology and Chemistry of the Earth's Interior crafted safety guidelines for individuals on active volcanoes, Live Science previously reported. 
  
 Pyroclastic flows, or fast-moving surges of lava and other molten material, have commonly raced down Mayon's flanks from its summit, often devastating populations below, according to the Smithsonian Institution Global Volcanism Program. Its most violent eruption, in 1814, killed more than 1,200 people. 
  
 Original article on Live Science. |||||
Output:
Residents of the island of Luzon in the Philippines have been lying in nervous wait after seismologists predicted last week that its Mayon volcano was exhibiting signs of an "imminent eruption." On Monday, the prospect of danger was raised further, with the threat level jumping from three to four (on a scale that goes from one to five) after explosions rocked Mayon and caused "fountains of lava" to burst from its summit, Live Science reports. And the eventual eruption is predicted to be "violent," government officials say. "The public is strongly advised to be vigilant and desist from entering this danger zone," the Philippine Institute of Volcanology and Seismology warned in a statement, noting that danger zone had been expanded to a 5-mile radius from where the summit vents. Pilots whose flights haven't been canceled are being advised not to fly anywhere near the summit, as spit-out ash can pose risks to planes. An ash plume has already stretched 4,300 feet into the air as a result of the lava bursts, a press release from the Philippines' Office of Civil Defense notes, per CNN. "It was like nighttime at noon, there was zero visibility in some areas because the ash fall was so thick," a local disaster response official tells ABC News. A Civil Defense rep adds that more than 24,000 locals have been moved to evacuation shelters, and another 3,100 or so have gone to hunker down with family and friends. A provincial governor advises everyone in the vicinity to cover their faces with masks (more than 30,000 have been handed out) and stay inside; schools in the area are all closed. Officials say there have been no reports of injuries.