The Toronto Police Services board is challenging the effectiveness of several police surveillance cameras that were set across the city, newspaper reports say.

The Toronto Star says the board rejected Police Chief Bill Blair's recommendation to keep using the cameras because the board is concerned with the effectiveness of the system to deter crime.

Police will keep using the cameras in the meantime, but Blair will have to report on how and where the cameras will be used -- plus he'll need to have "their effects on crime independently evaluated by an academic expert," the Globe and Mail reports.

The cameras have been used in a $2 million pilot project which started in 2007.