A Palestinian security prisoner was caught attempting to smuggle 11 cellphones into Megiddo Prison in northern Israel last week, the Israeli Prison Service announced on Sunday.

Guards at Megiddo became suspicious of the prisoner’s behavior while he was being processed for detention following his arrest last Tuesday.

Running a magnetometer over his stomach indicated the presence of foreign items, and subsequent X-rays performed at HaEmek Medical Center in Afula revealed three packages containing 11 cellphones and 15 SIM cards in his lower abdomen, the prison service said.