Israeli airstrikes on Saturday killed at least 11 people and injured dozens in central Beirut, as diplomats scrambled to broker a cease-fire. Lebanon’s civil defence said the death toll was provisional as emergency responders were still digging through the rubble looking for survivors.

The strikes were the fourth on the Lebanese capital in less than a week. The escalation comes after US envoy Amos Hochstein travelled to the region this week in an attempt to broker a cease-fire deal to end the more than 13 months of fighting between Israel and Hezbollah, which has erupted into full-on war in the past two months.