The PSNI in Derry today said officers were pelted with bricks and bottles by a crowd after they attempted to protect occupants of van which had broken down in Maghera.
The attack took place after the van stopped on the Moneysharvan Road at around midnight last night.
Several cars pulled up alongside the vehicle and blocked its path. The men in the van fled but a crowd which had gathered at the scene threw missiles at police when they arrived, damaging one car.
A number of makeshift weapons were recovered by officers including sticks. An Orange Hall at nearby Killygullib was petrol bombed following the incident.
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Scorch damage was caused to the inside of the building and police said they are investigating a link between the two attacks.