It will consider a joint lawsuit against Toronto police following mass arrests at the G20 summit in the city, says a Canadian civil liberties group.

The Toronto Star reported on Thursday that more than 1,000 arrests were made during the summit last weekend amid allegations peaceful demonstrators, or even bystanders, were caught up in mass arrests.

It has been overwhelmed with phone calls and complaints, The Canadian Civil Liberties Association has said.

Nathalie Des Rosiers, CCLA general counsel, said, "The CCLA is planning to help people who are seeking compensation to (initiate) a lawsuit in the Superior Court of Ontario. We have a couple of plaintiffs."

Police Chief Bill Blair said police officers' actions were justified because violent protesters infiltrated peaceful demonstrations or protesters failed to disperse when asked.

The Star has reported that Blair has announced an internal police review but there are growing demands for a public inquiry. (With Inputs from Agencies)