The Israeli military carried out strikes on Hezbollah “drone factories” in southern Lebanon and suburbs of Beirut on Thursday, as large plumes of smoke could be seen rising from the Lebanese capital.

The airstrikes on the southern outskirts of the Lebanese capital, an area where Hezbollah holds sway, were some of the heaviest since a U.S.-brokered cease-fire came into effect in November.

The Israeli military struck several sites in Beirut’s southern suburbs that it said held underground facilities used by Hezbollah for drone production Thursday, on the eve of the Eid al-Adha holiday.