JERUSALEM - Israeli forces arrested three Palestinians overnight as they tried to enter Israel from the southern Gaza Strip, a military spokesman said on Thursday. "Late last night, three men approached the border fence from southern Gaza to infiltrate into Israel. They were picked up by troops immediately after they crossed," a military spokesman said. "We found a fragmentation grenade on one of the men. They were detained and held for questioning." A Palestinian security source claimed the incident involved only two men, and said they were detained overnight inside Gaza by Israeli special forces.