Officials are finding answers into what caused the home explosion in Arlington County, Virginia, late last year.

Investigators concluded that James Yoo, 56, likely engaged in a series of bad acts that caused the explosion and destruction of his home at 844 N. Burlington Street, in the Bluemont neighborhood. Area residents reported feeling their homes shake due to the explosion and 10 neighboring houses were damaged as a result.

Investigators found gasoline canisters, shotguns, a firearm, two flare guns, shotgun magazines, loose shotgun rounds, and fired and unfired flares from the remains of the home. They determined that the explosion “was intentionally caused by the suspect and involved gasoline.”

“Although we are not able to determine what the specific ignition source was, the likely competent ignition sources that were identified by our investigators were multiple shotguns, a pistol, multiple flare guns, and or the use of matches or a lighter,” an official said.

Arlington County Police Department officials believed the cause of the explosion was brought into the home. In the last year, Yoo had purchased more than $10,000 in firearms and related paraphernalia. Neighbors told police they did not often see Yoo but believed he had a history of mental illness after he recently received a bulk shipment of bleach, charcoal, and lighter fluid.

At 4:45 p.m. that December day, the ACPD was notified of flares being fired from the home. Yoo, who was inside, did not engage with law enforcement officers, but they later obtained search warrants. Around 7 p.m., ACPD officers turned off the gas to the home out of precaution and evacuated nearby residents.

An hour later, the home exploded with Yoo inside.

“While we had no indication that the house was going to explode, precautionary metric measures were taken to mitigate any potential risks — to protect the community and first responders,” Arlington Fire Department officials said.

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The Bureau of Alcohol, Tobacco, Firearms and Explosives concluded that Yoo was likely the one who caused the explosion from his basement because investigators found an empty five-gallon gas canister along with others that were full.

“There is no evidence pointing to ACPD providing the ignition source or the cause of the explosion,” according to the report. “On the other hand, the copious evidence of gasoline, flares, and firearms near Mr. Yoo’s body and around the home do provide a basis to believe the ignition source was Mr. Yoo — regardless of whether the ignition was caused intentionally or accidentally.”