At least three Palestinians were slightly wounded on Monday when dozens of settlers rioted near Nablus, hurling stones at cars and shops, breaking windows and causing damage.
Police say they have launched an investigation.
The settlers were celebrating the release of one of their group from detention after he was charged with hurling a stun grenade at a Palestinian home.
The incident comes days after a group of settlers attacked Palestinian farmers and left-wing supporters using stones and sticks near an illegal outpost on the West Bank causing injuries.