Israel calls his attacks in Iran “preventive”. What does international law say?

Causes at the city trips, pilots and businesses: not only in Israel, but also in Iran since Friday morning, when Israel was surprisingly attacking Iran, massive panic in the civilian population. “Nowhere are we sure,” residents complain about the lack of warning sirens and protective bunkers. Those who have received Israeli warnings that they should avoid areas near military facilities are also panicked: “How should we know where a military facility is?”