JERUSALEM (AP) — Unidentified militants infiltrated Israel early Monday, opening antitank fire against Israeli civilians building a security fence along the border with Egypt’s turbulent Sinai desert, the Israeli military said.

Israeli radio and TV stations reported that one worker was killed and that an explosive device was also set off during the attack. Military spokesman Brig.-Gen. Yoav Mordechai told Israel Radio that one militant was shot dead by forces who arrived at the scene.