JERUSALEM (Reuters) -An Arab assailant killed at least four people in Israel’s southern city of Beersheba on Tuesday in the deadliest such attack in years, before he was fatally shot by a passer-by, police said. Police identified the attacker as an Arab citizen of Israel, a former high school teacher who had been imprisoned over alleged links to Islamic State. Police spokesman Eli Levy said “a civilian took the initiative and shot and killed” the knife-wielding assailant, a confrontation on a busy city street that later played out in videos filmed by onlookers and broadcast on Israeli televisi…