COSTA MESA, Calif. (AP) — A neighbor says a man killed by a homemade explosive at his California home was an eccentric who distributed rambling anti-government pamphlets around his quiet neighborhood.

Police say 16 neighbors remained evacuated Monday as a bomb squad searched the Costa Mesa home.

Authorities say at least three homemade explosives, including at least one pipe bomb, were found and detonated.

The man, whose name wasn't released, died Sunday night. Police haven't said whether the blast was accidental or a suicide.

Neighbor Donna Swift says the longtime resident would ride his bicycle around town, distributing pamphlets proclaiming government conspiracy theories. She says police took him for a mental exam about 11 years ago but he never seemed threatening.

THIS IS A BREAKING NEWS UPDATE. Check back soon for further information. AP's earlier story is below.

A man was blown up in his California home and at least 16 neighbors were evacuated as authorities found and destroyed other explosive devices, police said Monday.

A bomb squad descended on a quiet street of ranch homes in the Orange County city of Costa Mesa after the 52-year-old man died in a Sunday night blast.

An ambulance had been called about 90 minutes earlier when neighbors saw the man lying on his front lawn and he refused offers of help.

Police were called about 7:30 p.m. after neighbors heard the explosion, and the man was found dead at his home.

Police suspect he was killed by some sort of homemade explosive.

At least two other explosive devices were later found at the home, police Sgt. Jerry Hildeman said.

Neighbors from surrounding homes were evacuated and remained out of their homes Monday morning. They will be allowed to return when the house is declared safe, police said.

The FBI, an Orange County Sheriff's Department bomb squad and other agencies responded to the scene.