One injured when bus crashes into downtown Boise ID. office building.

A public transit bus crashed into a downtown Boise office building on Monday, leaving the front of the vehicle dangling over an underground parking garage.

About 12 people were on the ValleyRide bus and police said most were uninjured. One woman, who had a pre-existing injury, was taken to a hospital for treatment.

A ValleyRide spokesman said the crash was under investigation after the driver reported the brakes were not working when he approached an intersection near the nine-story Idaho Power building,

The driver had to take quick evasive action to avoid hitting cars stopped ahead of the bus.

The bus careened over a curb and into a parking lot, running over street signs and small trees before crossing a street and crashing into the office building.

Initial estimates suggest the bus was traveling about 20 mph.