Updated

Lebanon's Hezbollah TV is reporting that Islamic State militants have started leaving the border area with Syria as part of a negotiated deal to end the group's presence there.

Nearly two dozen buses and 11 ambulances carried an unknown number of IS militants and their families on Monday from the rugged mountain area in Syria straddling the Lebanese border, toward the IS-held Boukamal, a town in eastern Syria along the border with Iraq.

The deal follows a Lebanese military campaign to drive out IS militants from an area in Lebanon, about 120 square kilometers (46 square miles) in size, along the Syrian border.

Separately but simultaneously, the Syrian army and its Hezbollah allies began carrying out their own offensive to pressure IS on the Syrian side of the border.