Israeli Prime Minister Benjamin Netanyahu has vowed to hit Hezbollah without mercy, a day after the Lebanese group’s deadliest strike on Israel since the start of the fighting in late September, AFP reports.

Hezbollah’s drone attack on an Israeli base killed four soldiers on Sunday, while volunteer rescuers said another 60 people were injured.

“We will continue to mercilessly strike Hezbollah in all parts of Lebanon — including Beirut,” Netanyahu said on a visit to the base near Binyamina, south of Haifa.

Prior to Netanyahu’s comments, new air strikes had already occurred against targets around Lebanon, including one in a northern Christian-majority village which killed at least 21 people on Monday, according to the health ministry.

Since Israel last month escalated its bombing in Lebanon before sending ground troops across the frontier, the offensive has killed at least 1,315 people, according to an AFP tally of Lebanese health ministry figures, though the real toll is likely higher.