Authorities arrest 35 , search 23 locations in California in probe of attacks targeting police . Police hope sweep will lead to information about those responsible for the attacks . Four booby trap-style attacks against The Hemet Police Department have occurred since December . Attacks could be gang-related , but motive unclear , Hemet police captain says .
Authorities arrest 23 , search 35 locations in Riverside County in probe of attacks targeting police . Police hope sweep will lead to information about those responsible for the attacks . Four booby trap-style attacks against Hemet Gang Task Force have occurred since December . Attacks could be gang-related , but motive unclear , Hemet police captain says .