Police say a fire at a GAA clubhouse in Derry on Wednesday was arson.
The blaze at Sean Dolan’s Club in the Creggan Estate caused extensive damage.
The PSNI originally said they thought the fire started accidentally but later issued a statement saying they believed it was started deliberately.
Detectives are re-issuing their appeal for witnesses and want anyone who may have information to contact them.
The statement also said a senior officer is reviewing every action taken by police from the first call received about the fire, evidence taken, CCTV footage viewed and lines of inquiry followed up by the investigating officers.
They are also encouraging anyone with a concern about police action to report the matter to the Police Ombudsman’s Office.
Meanwhile, Sinn Fein MLA Raymond McCartney has said he has seen CCTV footage which he claims proves that the fire was started deliberately.
Mr. McCartney said it showed hooded men outside the building before the fire started.
“It was absolutely arson in our opinion, we have said that from the beginning,” he said. “The PSNI made a statement on Thursday that this fire was not suspicious, indeed they said it was an accident.
“When you examine the CCTV footage which was in their possession, then there are suspicions around this and I think this will lead to an investigation.”