Arson investigators are continuing to search for clues about the circumstances surrounding a west-end blaze that caused $5 million in damages at a local plaza.

"We have the office of the fire marshal investigator down with us, along with an investigator from the Ottawa Fire Service," Det. Perry Biddiscombe, of the Ottawa police arson unit, told CTV Ottawa on Sunday.

"We're going to be just conducting an exterior examination of the building, taking video and photographs."

The building, located on Richmond Road, went up in flames early Friday morning, destroying two stores, a pawn shop and two restaurants, including the popular Rockin' Johnny's Diner.

Although the investigation continues, two Ottawa residents are already behind bars. Wael Chamoun, 29, and Shyla McGregor, 21, are both charged with five counts of arson.

The owner of Rockin' Johnny's says at least one of the names sounds familiar.

Rathinapillai Jegatheesvaran told CTV Ottawa a former employee has the same first name as one of those arrested. However, he says he's still waiting to find out more information from police.

"If I see a person, probably I can identify. Other than that, I don't know," he said,

Police are also investigating the circumstances surrounding the injuries of a 22-year old man who was treated in hospital for severe burns.

Meanwhile, police say arson is the cause of a fire that ate through a two-storey commercial building on Bank Street late Thursday night. Fire officials say the second floor of the building, which houses West Coast Video and Elee Spa, was fully engulfed in flames when crews arrived.

Officials are also calling a blaze at an auto shop on St. Patrick Street 'suspicious.'

In the meantime, investigators are still trying to determine if the fires are connected.

"We're still investigating, conducting the investigation into that link. At this point we can't comment on that," said Biddiscombe.

Back at the charred Richmond Road plaza, Jegatheesvaran plans to find a way to rebuild his life and help his 18 employees find new jobs.

"This is my life you know -- I spend more time here than at my house," he said.

"I want to know the people who did this and who's behind them and why they do this kind of disaster."

With a report from CTV Ottawa's Catherine Lathem