The head of Israel’s security agency, Shin Bet, has warned the country’s leaders that Jewish terrorism in the West Bank is out of control and has become a serious threat to national security.

Ronen Bar issued the warning in a letter to the prime minister, Benjamin Netanyahu, the attorney general and members of the Israeli cabinet, some of whom are outspoken backers of the extremist settlers responsible for the escalating violence.

Bar’s letter, sent last week but published by Israel’s Channel 12 News on Thursday night, has highlighted the wide, acrimonious gap between the far-right wing of Netanyahu’s coalition and Israel’s security apparatus.

The national security minister, Itamar Ben-Gvir, one of those criticised by Bar for inflammatory behaviour, called for the Shin Bet head to be fired, triggering a rebuke on Friday from the defence minister, Yoav Gallant.