JERUSALEM — At least three Palestinians were killed during clashes with Israeli security forces in the West Bank on Wednesday and Thursday, and an Israeli soldier was seriously wounded in a car ramming in Jerusalem overnight, in a surge of violence following the release of the long-awaited — and highly contentious — American plan for Middle East peace.

Among the three Palestinians were a Palestinian Authority police officer, whom Israeli forces said they shot by mistake, and a police cadet.

A fourth man armed with a pistol opened fire before noon Thursday on Israeli border police officers outside the Aqsa Mosque compound in the Old City of Jerusalem, wounding one in the arm.

The attacker, who was shot dead by the police, was an Arab resident of Haifa, in northern Israel. According to Israeli news media reports, he had recently converted to Islam.