Joseph Callahan allegedly stockpiled 274 guns, tens of thousands of rounds of ammunition, 250 gallons of jet fuel and other chemicals in his $1 million mansion in Fairfield, Conn.
He was arrested on Monday and charged with 11 counts of illegal possession of explosives, six counts of first-degree reckless endangerment and one count of manufacturing bombs.
According to The Courant, police entered the home after a reported burglary on Oct. 1.
To their surprise, authorities found the massive collection of weapons, chemicals, ammunition and explosive devices (video below).
The road to Callahan's five-bedroom home was closed for two days while authorities removed the weapons and chemicals to make sure the area was safe.
However, police do not know what Callahan planned to do with the weapons, if anything at all.
"There's no indication he was working on the chemicals. There is no indication he was sick as a result of the chemicals. It appears initially that these chemicals, right now as they are, are stable," Fairfield Police Chief Gary MacNamara told ABC 7.
Callahan is president of the Remair chemical company, but previously worked at gun manufacturer Remington Arms for nearly 20 years, notes CTPost.com.
Callahan was released from custody to help remove the remaining dangerous chemicals. Haz-mat professionals and fire department officers are staying on the property until all of the chemicals are disposed of.
Callahan is scheduled to appear in court on Oct. 16 in Bridgeport, Conn.