The investigation into explosions at a U.S. Army depot in Japan has found there was no nitrogen, Freon or compressed air on site, contrary to original reports, officials said Tuesday.

Multiple explosions and a large fire were reported after midnight local time Monday at the Sagami General Depot in Sagamihara, a city about 25 miles southwest of Tokyo, officials said.

Photos taken after daybreak and released by the Army show dozens of gray canisters lying on the floor, and what looks like mangled storage racks. The walls of the one-story, concrete building remain intact, but the windows and doors are damaged and about half of the roof collapsed, the Army said. There are no indications of injuries.

About 500 Japanese and 300 American troops and civilians work at the depot, said Lt. Col. Kevin Toner, a spokesman for U.S. Army Japan.

Investigators from the Army and experts from the Sagamihara City Fire Department determined the canisters in the depot contained either oxygen or fire extinguisher materials, Toner said in a statement released Tuesday.

The facility is able to store nitrogen, Freon or compressed air, but investigators believe those gasses were not present at the time of the explosion, Toner said.

Initial findings from the investigation, which is ongoing, suggest the explosion was not related to criminal activity, Toner said.

Meanwhile, an Army official met with the Sagamihara City vice mayor Monday to "share information and express our regret for any anxiety" the incident has created with the Japanese public, Toner said.

The damaged roof of a warehouse (C) caused by a blast is seen at the US Army Sagami General Depot in the city of Sagamihara, some 25 miles (40 kilometres) southwest of Tokyo, on August 24, 2015. A blast ripped through a warehouse at a US military post near Tokyo early August 24, sending sparks shooting into the sky and triggering a blaze that burned through the night, but there were no reports of injuries. AFP PHOTO / Toru YAMANAKA (Photo credit should read TORU YAMANAKA/AFP/Getty Images)

The damaged roof of a warehouse caused by a blast is seen at the U.S. Army Sagami General Depot in the city of Sagamihara, Japan.

Photo Credit: Toru Yamanaka/AFP

The Sagami General Depot sits on the grounds of a former Japanese Imperial Army installation that opened in 1935, according to U.S. Army Japan. The facility was primarily used to manufacture armaments and weapons, mostly tanks, for the Japanese Army.

In September 1945, Sagami was occupied by the U.S. Army's 5th Cavalry Regiment. Two years later, the Americans began scaling back operations at Sagami.

Today, it is used as a logistics and supply facility. It stores Army Prepositioned Stocks, equipment that can be used in crisis or contingency; medical supplies make up most of the equipment at Sagami, according to U.S. Army Japan.

The facility also is home to the headquarters of the 35th Combat Sustainment Support Battalion, a logistics unit prepared to support the Asia-Pacific theater, as well as the Mission Training Complex, a simulation center used for training and exercises. Elements of the 403rd Army Field Support Brigade, whose mission includes managing the prepositioned stocks and maintenance activities, also are housed at Sagami.

The facility also is an operational contingency base that would be used during crises or disaster response, officials said.

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