Suspected Jewish extremists torched the entrance to a mosque in the West Bank early on Wednesday, in an apparent revenge attack for Palestinians beating and detaining Israeli settlers last week.
The attackers scrawled "Arabs out" and "Revenge for blood spilled in Qusra" in Hebrew on the walls of the mosque in Deir Istiya village, which lies next to the sprawling Ariel settlement in the northern West Bank, an AFP correspondent said.
Police spokeswoman Luba Samri said in a statement the attacks were "nationalistically" motivated.
Palestinians beat and detained around a dozen settlers last week in the village of Qusra, near the northern city of Nablus, and released them after negotiating with Israeli soldiers.
Seven of the settlers were arrested on suspicion of provoking the violence when they entered Qusra from Esh Kodesh, an illegal settlement outpost nearby.
The January 7 incident in Qusra has already sparked other revenge attacks, when suspected Jewish extremists torched two cars near Nablus and cut down trees belonging to Palestinians in an Arab-Israeli town east of Tel Aviv.
Palestinian property is often targeted by Jewish extremists who carry out so-called "price tag" attacks, usually for state moves against unauthorised settlement activity in the West Bank.
Perpetrators of the attacks have also targeted Muslim and Christian sites, as well as Arab property in Israel.