SHIKARPUR: The Chak police claimed to have arrested four criminals on Saturday and registered a case against them. The reports said that police raided a point on a tip-off and busted four criminals who opened fire on the van of the police so that they could manage to flee. Police officials also opened fire on them and seized them along with weapons. The arrested criminals identified as Warial, Atta-ur- Rahman, Ghulam Ali Murtaza and Taj Muhammad Mahar. Police said that they have started an investigation against them.