Ottawa, Jan. 12 -- A double-deck city bus smashed into a transit shelter during Friday's rush hour, and Ottawa authorities said three people were killed and 23 injured.

Police Chief Charles Bordeleau said the bus driver was arrested after the crash, but he declined to provide details on why she was detained. He said police were still investigating the cause of the crash.

"Something led us to having to arrest the individual and take them to the station," Bordeleau said.

The crash took place west of downtown at 3:50 p.m., just as dusk was beginning to settle on the coldest day of the winter so far in Canada's capital

Two of the dead were riding the bus and one was on the platform at Westboro station, a major stop on the city's busway, M...