FEDERAL HEIGHTS, Colo. (AP) — Police say investigators found at least 12 explosive devices inside a mobile home whose owner admitted to using gasoline to set his own and another house on fire.

Police were called to the suburban Denver area on Wednesday afternoon.

The Federal Heights Police Department says 56-year-old Steven Truetken told officers that he planned setting the fires "for some time."

Police say Truetken faces charges including attempted murder. It's not clear if he has an attorney.

Authorities say at least two other suspected bombs were found. Bureau of Alcohol, Tobacco, and Firearms officers helped collect samples on Thursday.

Authorities also said Truetken told police he planned to use a hose and his water heater's gas line to fill his home with natural gas and cause an explosion but didn't activate it.