A Longmont man accused of keeping explosive chemicals and handguns in his home has been charged with ten counts of possessing illegal explosives and one count of drug possession.
Fifty-year-old retired electrical engineer Ronald Swerlein was arrested last Sunday after local and federal agencies spent the weekend searching his home.
Neighbors had reported hearing three explosions at the house three days earlier.
Authorities says they found more than 400 chemicals in Swerlein's house and books on homemade explosives.
They also reported finding magazines from the Animal Liberation Front, which the F.B.I. considers to be a terrorist group.
Swerlein told police he was developing fuel for model rockets.