CHAMAN- The security forces arrested four terrorists during a crackdown and recovered arms, secret documents and maps from their possession today. The security forces on a tip of conducted raid at a house in Pak-Afghan border area of Chaman. During operation, four terrorists including Afghan intelligence personnel were arrested. Arms, secret documents and maps of sensitive installations were also recovered from the possession of detainees. In the preliminary interrogation the nabbed terrorists have admitted their involvement in Chaman blasts.