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Philippine police launch criminal investigation into factory fire that trapped, killed 72

  • Members of Scene of the Crime Operatives of the Philippine National Police carry body bags containing the remains of victims, a day after a fire gutted Kentex rubber slipper factory in Valenzuela city, a northern suburb of Manila, Philippines, Thursday, May 14, 2015. A fire gutted the factory, possibly killing dozens of workers who ran to the second floor in hopes of escaping only to become trapped by inferno, officials said. (AP Photo/Bullit Marquez)

    Members of Scene of the Crime Operatives of the Philippine National Police carry body bags containing the remains of victims, a day after a fire gutted Kentex rubber slipper factory in Valenzuela city, a northern suburb of Manila, Philippines, Thursday, May 14, 2015. A fire gutted the factory, possibly killing dozens of workers who ran to the second floor in hopes of escaping only to become trapped by inferno, officials said. (AP Photo/Bullit Marquez)  (The Associated Press)

  • Activists hold slogans while they mourn for victims of a fire that gutted the Kentex rubber slipper factory during a rally in Manila, Philippines on Thursday, May 14, 2015 . The group alleged that the deaths of dozens of trapped workers is due to violations of occupational health and safety standards by owners of the factory. (AP Photo/Aaron Favila)

    Activists hold slogans while they mourn for victims of a fire that gutted the Kentex rubber slipper factory during a rally in Manila, Philippines on Thursday, May 14, 2015 . The group alleged that the deaths of dozens of trapped workers is due to violations of occupational health and safety standards by owners of the factory. (AP Photo/Aaron Favila)  (The Associated Press)

  • Philippine National Police stand beside the body bags of fire victims at Kentex rubber slipper factory in Valenzuela city, a northern suburb of Manila, Philippines, Thursday, May 14, 2015. On Thursday, police will open a criminal investigation into the incident that killed dozens of people, as a relative of several of the victims said the blaze had trapped workers in the building's second floor where iron grills on windows prevented their escape. (AP Photo/Bullit Marquez)

    Philippine National Police stand beside the body bags of fire victims at Kentex rubber slipper factory in Valenzuela city, a northern suburb of Manila, Philippines, Thursday, May 14, 2015. On Thursday, police will open a criminal investigation into the incident that killed dozens of people, as a relative of several of the victims said the blaze had trapped workers in the building's second floor where iron grills on windows prevented their escape. (AP Photo/Bullit Marquez)  (The Associated Press)

Police will open a criminal investigation into a Philippine factory fire that killed at least 72 people, as a relative of several of the victims said Thursday the blaze had trapped workers in the building's second floor where iron grills on windows prevented their escape.

Most of the bodies were retrieved from the gutted two-story Kentex Manufacturing Corp. rubber slipper factory a day after the fire raged for over five hours in the outskirts of the capital, Manila.

As forensic officers worked to identify the dead and reconcile their names with those listed as missing, questions were being raised if the factory followed fire and building safety standards.

Dionesio Candido, whose daughter, granddaughter, sister-in-law and niece were among the missing, said iron grills reinforced with fencing wire covered windows on the second floor that "could prevent even cats from escaping."

He said he was allowed by authorities to enter the gutted building, where he saw charred remains "piled on top of each other."

Local media reports quoted relatives as saying their kin sent frantic text messages asking for help from second floor, but contact was lost shortly after.

Police will file charges against "all those accountable and those at fault," said police Deputy Director General Leonardo Espina.

Valenzuela city fire marshal Mel Jose Lagan said arson investigators will look into why the people were unable to escape from the second floor when there was a "sufficient exit" that includes a wide stairway to the back of the building leading to the outside. They will also look into whether there were more people inside the building than allowed.

Iron grill bars on windows are common in offices, factories and homes in the Philippines to keep away thieves. In workplaces or factories, they are also meant to prevent employees from stealing equipment or products.

Valenzuela Mayor Rex Gatchalian said that a workers log book was lost in the fire and the foreman was among the dead, making it difficult to determine how many were inside the factory at the time.

The chief of the national police medical examiner's office, Emmanuel Aranas, said fingerprints could no longer be used to identify the burnt victims and forensic officers will have to rely on dental records, DNA and personal items to identify the bodies.

Gatchalian said the fire was apparently ignited by sparks from welding work at the factory's main entrance door, triggering an explosion of the chemicals used to make the slippers. Workers fled to the second floor where they were trapped, he said.

District Fire Marshal Wilberto Rico Neil Kwan Tiu said that the building had other exits but apparently the workers were overwhelmed by the thick black smoke from the burning rubber and chemicals, which are highly flammable and caused the blaze to spread quickly.

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Associated Press writer Teresa Cerojano contributed to this story.