The article said he was killed "as he was driving his wife to their country home east of Tehran". So it's probable that the Israelis knew about his house in the

The article said he was killed "as he was driving his wife to their country home east of Tehran". So it's probable that the Israelis knew about his house in the country and found out when he'd be going, and picked out a spot on the route that would serve the purpose, maybe on a part of the road that very few people use.