MILITARY

Explosion at US Army base outside Tokyo lights up night sky; no injuries reported

  • U.S. Army Sagami Depot in Sagamihara, southwest of Tokyo is damaged Monday, Aug. 24, 2015. Multiple explosions and a large fire at the depot lit up the night sky in a Tokyo suburb early Monday. No injuries were reported. (Kyodo News via AP) JAPAN OUT, MANDATORY CREDIT

    U.S. Army Sagami Depot in Sagamihara, southwest of Tokyo is damaged Monday, Aug. 24, 2015. Multiple explosions and a large fire at the depot lit up the night sky in a Tokyo suburb early Monday. No injuries were reported. (Kyodo News via AP) JAPAN OUT, MANDATORY CREDIT  (The Associated Press)

  • In this image provided by the U.S. Army, the roof is partially collapsed as canisters of compressed gases including nitrogen, oxygen, Freon, and air are strewn about in one-story concrete building after an explosion at the U.S. Army Sagami Depot in Sagamihara, about 25 miles (40 kilometers) southwest of Tokyo, Monday, Aug. 24, 2015. An explosion at a U.S. Army depot outside of Tokyo set off a large blaze that lit up the night sky early Monday morning, but there were no reports of injuries. (U.S. Army via AP)

    In this image provided by the U.S. Army, the roof is partially collapsed as canisters of compressed gases including nitrogen, oxygen, Freon, and air are strewn about in one-story concrete building after an explosion at the U.S. Army Sagami Depot in Sagamihara, about 25 miles (40 kilometers) southwest of Tokyo, Monday, Aug. 24, 2015. An explosion at a U.S. Army depot outside of Tokyo set off a large blaze that lit up the night sky early Monday morning, but there were no reports of injuries. (U.S. Army via AP)  (The Associated Press)

  • In this image provided by the U.S. Army, a door is damaged as canisters of compressed gasses including nitrogen, oxygen, Freon, and air are strewn about in one-story concrete building after an explosion at the U.S. Army Sagami Depot in Sagamihara, about 25 miles (40 kilometers) southwest of Tokyo, Monday, Aug. 24, 2015. An explosion at a U.S. Army depot outside of Tokyo set off a large blaze that lit up the night sky early Monday morning, but there were no reports of injuries. (U.S. Army via AP)

    In this image provided by the U.S. Army, a door is damaged as canisters of compressed gasses including nitrogen, oxygen, Freon, and air are strewn about in one-story concrete building after an explosion at the U.S. Army Sagami Depot in Sagamihara, about 25 miles (40 kilometers) southwest of Tokyo, Monday, Aug. 24, 2015. An explosion at a U.S. Army depot outside of Tokyo set off a large blaze that lit up the night sky early Monday morning, but there were no reports of injuries. (U.S. Army via AP)  (The Associated Press)

An explosion at a U.S. Army depot outside of Tokyo has set off a large blaze that lit up the night sky, but there were no reports of injuries.

The U.S. Defense Department says the explosion happened after midnight in Japan on Monday at the Sagami Depot in Sagamihara, a city about 25 miles (40 kilometers) southwest of Tokyo.

A statement issued by the Army in Japan adds that the cause is unknown, and there are no indications of injuries. The Army says the building was not a hazardous material storage facility, and that the depot does not store ammunition or radiological materials.

A duty officer at the Pentagon says base firefighters and first responders are fighting the fire to prevent its spread to nearby buildings.