Clearlake Police are trying to determine whether a paroled arsonist was responsible for a makeshift bomb found lit under a trailer early Friday.

A resident noticed the flaming explosive at the Ponderosa Mobile Home Park in Clearlake just after midnight Thursday, dousing the lit fuse and preventing it from exploding, police said.

Authorities evacuated the area nonetheless and sealed it off until members of the Napa County Bomb Squad removed the device and destroyed it, police said.

Police would not offer any other details about the type of explosive or materials used.

Police questioned a convicted arsonist they knew was on parole and living in the area, Lt. Mike Hermann said. A search of registered arsonist Donald Ferris? home turned up unidentified materials ?consistent? with the detonated explosive, police said.

Hermann would not say what, if any, connection Donald Ferris, 47, has with the mobile home park.

He said Ferris ?doesn?t live in the mobile home park at this time? but would not say if he had previously.

Ferris was arrested Friday morning for violation of parole pending continuing investigation into the makeshift bomb, authorities said.

Police said the materials seized from his home were sent to the state Department of Justice for analysis.

Ferris was booked into the Lake County Jail and was being held without bail, jail personnel said.