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)

An Ottawa man has pleaded guilty to firebombing a Royal Bank of Canada branch in Ottawa's Glebe neighbourhood last spring.

Roger Clement, 58, entered the plea Tuesday morning.

Surveillance video from the bank showed a man pouring a liquid, thought to be gasoline, into the lobby of the building. Clement admitted to being that man.

Charges against Matthew Morgan-Brown, 32, were stayed.

A prosecutor said there was too little evidence to try him.

A third man, Claude Haridge, 50, was facing lesser charges of careless storage and handling of ammunition. Those charges were stayed, as well.

The details of Clement's role in the May 18 arson weren't revealed Tuesday. That's expected to happen during sentencing, which begins Dec. 6.

A statement posted online the day of the firebombing said the act was a protest against Royal Bank's financing of the Alberta oilsands and its sponsorship of the Vancouver Olympics, which exacerbated the "criminalization and displacement of those living in extreme poverty" in Canada's third-largest city.