At least three judges were on Saturday shot dead by gunmen in Egypt’s restive Sinai region, where security forces have been locked in a battle with Islamist insurgents backed by an outfit linked to the dreaded Islamic State group.The militant attack targeted a bus in Al-Arish city, killing the judges and wounding three others, an official said. The shooting happened hours after a Cairo court sentenced deposed President Mohammed Morsi and over 100 other Islamists to death over mass prison breaks during the 2011 uprising. However, no group has claimed responsibility for the attack yet.