Israeli police arrested four people suspected of taking part in a violent attack by Jewish settlers on the Palestinian village of Jit in the occupied West Bank, during which one Palestinian was killed, authorities said, Reuters reports.

The August 15 attack by dozens of settlers armed with guns and Molotov cocktails, drew unusual condemnation from Israeli leaders, including Prime Minister Benjamin Netanyahu, who promised a swift investigation.

“This was a severe terror event that included setting fire to buildings and vehicles, stone and molotov-cocktail hurling, as well as live fire, resulting in the killing of one Palestinian and the injuring of another,” a statement by the police and the domestic security agency said.