Israeli forces in southern Lebanon on Sunday opened fire on protesters demanding their withdrawal in line with a ceasefire agreement, killing at least 22 and injuring 124, Lebanese health officials reported.

The initial ceasefire plan, announced in late November, brought an end to 14 months of conflict between Israel and the Lebanese armed group Hezbollah. Brokered by the US and France, the agreement gave Hezbollah 60 days to end its armed presence in southern Lebanon and required Israeli forces to withdraw over the same period.

The U.S. said on Sunday that the agreement between Lebanon and Israel would remain in effect until Feb. 18, after Israel said on Friday it would keep troops in the south beyond the Sunday deadline set out in a U.