MANILA, Philippines — Five people, including a four-year-old child, were killed in a massive explosion at a pyrotechnics warehouse in the southern Philippines, emergency services said Sunday.

The Saturday afternoon blast at the Zamboanga City site tore a large hole in the ground, sent debris careening into nearby buildings and houses and ignited a blaze, fire investigator Luigi Chan told Agence France-Presse.

Four warehouse workers and the four-year-old son of one of the staffers were killed, Chan said.

The city disaster office confirmed the death toll and said another 38 people had been injured in the incident, eight of them seriously.

Authorities said they are investigating the cause of the explosion, which created a 20-meter (66-foot) crater, dismantled the depot's walls and rained rubble on a nearby soft drinks factory, a grains and flour warehouse and area homes.

"The most probable origin of the fire is the pyrotechnics stored at the warehouse," Chan told Agence France-Presse.

He said the blast radius extended more than 3,000 square meters (0.8 acres) and it took firefighters more than two hours to bring the blaze under control.

Firemen and rescuers rush to the scene of a firecracker factory blast in Zamboanga City on Saturday afternoon. PHOTOS BY ZAMBOANGA CITY DISASTER RISK REDUCTION MANAGEMENT OFFICE Firemen and rescuers rush to the scene of a firecracker factory blast in Zamboanga City on Saturday afternoon. PHOTOS BY ZAMBOANGA CITY DISASTER RISK REDUCTION MANAGEMENT OFFICE Firemen and rescuers rush to the scene of a firecracker factory blast in Zamboanga City on Saturday afternoon. PHOTOS BY ZAMBOANGA CITY DISASTER RISK REDUCTION MANAGEMENT OFFICE Firemen and rescuers rush to the scene of a firecracker factory blast in Zamboanga City on Saturday afternoon. PHOTOS BY ZAMBOANGA CITY DISASTER RISK REDUCTION MANAGEMENT OFFICE Firemen and rescuers rush to the scene of a firecracker factory blast in Zamboanga City on Saturday afternoon. PHOTOS BY ZAMBOANGA CITY DISASTER RISK REDUCTION MANAGEMENT OFFICE Firemen and rescuers rush to the scene of a firecracker factory blast in Zamboanga City on Saturday afternoon. PHOTOS BY ZAMBOANGA CITY DISASTER RISK REDUCTION MANAGEMENT OFFICE Firemen and rescuers rush to the scene of a firecracker factory blast in Zamboanga City on Saturday afternoon. PHOTOS BY ZAMBOANGA CITY DISASTER RISK REDUCTION MANAGEMENT OFFICE Firemen and rescuers rush to the scene of a firecracker factory blast in Zamboanga City on Saturday afternoon. PHOTOS BY ZAMBOANGA CITY DISASTER RISK REDUCTION MANAGEMENT OFFICE

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