JERUSALEM — A fire at a West Bank mosque last month was most likely caused by an electrical fault and not the result of arson, Israel’s police said on Sunday.

At the time, Palestinian officials charged that the mosque fire, in the Palestinian village of Mughayer, near Ramallah, was the work of Jewish extremists.

The police said that a joint investigation carried out by the Israeli police, fire service and Shin Bet security agency, with the help of Palestinian Authority investigators, ruled out arson because no evidence of flammable liquids and no Hebrew hate graffiti typical of attacks by Jewish extremists were found at the scene.

Instead, it concluded that the most likely cause was an electrical fault in the area of a heater, which appeared to have been moved from its original place by the time the investigators arrived.