Police are investigating what they say is a "deliberate" fire at a Catholic church in Derry.

It happened in an outbuilding beside the Holy Family on Aileach Road at around 10.30pm on Friday.

The blaze spread to the church and nearby parochial house, causing damage to both.

The outbuilding itself was completely destroyed.

The PSNI has said at this stage they believe two men may have been involved in starting the fire, and they are keen to identify them.

They are asking anyone who was in the area at around the time of the fire, or anyone who may have information regarding this crime, to come forward.