The fire at the Bank Street RBC branch on May 18 was recorded on a video posted on the internet, accompanied by a political statement from a group calling itself FFFC - Ottawa.The fire at the Bank Street RBC branch on May 18 was recorded on a video posted on the internet, accompanied by a political statement from a group calling itself FFFC - Ottawa. (CBC)

Ottawa police said they have made arrests in connection with the fire-bombing of a Royal Bank branch in Ottawa in May.

Police did not reveal any further details on the arrests, but said they would be holding a briefing for the media on Saturday morning, when they expect to lay charges.

The fire on Bank Street in the Glebe neighbourhood broke out about 3:30 a.m. ET on May 18, and was immediately viewed as suspicious after witnesses reported seeing people flee the scene.

The next day a video appeared on an independent media website showing the branch light up suddenly before flames spilled out the front of the building and two people walked out.

A message accompanying the video, signed by a group calling itself FFFC - Ottawa claimed RBC was targeted for its sponsorship of the 2010 Olympics.

Ottawa police led the investigation into the arson and received aid from the Ontario Provincial Police and Royal Canadian Mounted Police.

The RCMP became involved in the investigation in part because the group also said in its video that it would be present at the G8 Summit in Huntsville, Ont., and the G20 Summit in Toronto next week.