The CN Tower will be closed during the G20 Summit next month because of security concerns, marking the latest in a series of closures ahead of the high-level meetings.

The tower will be shut from June 25 to 27, and will reopen on June 28 to the public.

The announcement comes as concern grows over security at the summit.

Canadian banks are also on alert after an RBC branch was firebombed in Ottawa early Tuesday morning. A group calling themselves anarchists has claimed responsibility for the attack.

The fire caused about $300,000 worth of damage to the bank. The group that claimed responsibility said it bombed the bank because it was a major corporate sponsor of the 2010 Games in Vancouver.

Michel Juneau-Katsuya, a former CSIS analyst and a terror expert, said that the Ottawa incident will likely affect the way security officials undertake G20 preparations.

He said finding suspects in that case will be a top priority in the lead-up to the Toronto meetings.

Toronto Staff-Supt. Jeff McGuire said that despite the prospect for violence, officers will be ready.

McGuire said that officers are well-trained and well-equipped to deal with any outbreaks during the meetings.

Still, McGuire said that police are not expecting a large contingent of violent protesters.

Officials won't say how many officers will be brought in to Toronto to police the summit, and they won't reveal the location of their secret security command centre.

It is expected that the command centre will have access to the dozens of new security cameras that have been put recently.

The Toronto Blue Jays have also been forced to play a series with the Philadelphia Phillies out of town during the summit.

Meanwhile, police say that they will use "un-scalable" fences, similar to those used during the Molson Indy race, to keep crowds away from secure areas.

The meetings between leaders from the world's most powerful countries will mostly occur in the downtown area, clustering around the Metro Toronto Convention Centre.

With a report from CTV Toronto's Naomi Parness