Israel hit a Beirut suburb with an airstrike, not long after Hezbollah pounded northern Israel with 140 rockets following a vow by the militant group’s leader Hassan Nasrallah to retaliate against Israel for a mass bombing attack.

The Israeli military said it had carried out a targeted strike in Beirut on Friday which security sources in Lebanon said had hit near key Hezbollah facilities in the southern suburbs of the city, marking a sharp escalation of the conflict between the sides.