Damage from the firebombing at this Royal Bank branch in Ottawa on May 18 was extensive. (Fred Chartrand/Canadian Press)

Three men charged in the firebombing of a Royal Bank branch in Ottawa's Glebe neighbourhood in May made a brief court appearance on Monday.

Two of the accused — Claude Haridge, 50, and Roger Clement, 58 — appeared via videolink on Monday and will return to court on Tuesday.

The third man, 32-year-old Matthew Morgan-Brown, will make another appearance next week.

All three were arrested and charged on Saturday in connection with the May 18 fire at the bank.

Clement and Morgan-Brown were charged with arson causing damage, possession of incendiary material and using explosives with intent to cause property damage and mischief. Haridge faces charges of careless storage and handling of ammunition.

Clement and Haridge were also charged with mischief in connection with an incident at the same bank last February, when witnesses saw men damage windows and an ATM with rocks and a hammer.

Police said they seized hundreds of bullets during raids that led to charges against the three men, who are all from the Ottawa area.

Police say further charges possible

The firebombing attracted national attention after a video appeared on an independent media website the following day.

The video showed 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. It also threatened action against the G20 summit in Toronto.

Ottawa police Chief Vern White said the investigation that led to the arrests was done in conjunction with the RCMP and Ontario Provincial Police.

RCMP spokesman Sgt. Mark Menard said the investigation continues.

"Further charges are possible if the evidence warrants it," said Menard. "We are going to follow up all leads, leave no stones are left unturned and we are going to continue to work to ensure there's a successful conclusion. "

Haridge's neighbours in the Ottawa community of Stittsville said they were surprised to learn of Saturday's arrests.

Kevin Rothwell described his next-door neighbour as a quiet man who liked to garden, and said it was frightening to think he may have anything to do with explosives.

"But I'm still not sure what I think," said Rothwell.

With files from the CBC's Ashley Burke