SASKATOON -- Additional and more serious charges have been laid against a 17-year-old girl after a fatal crash in Saskatoon this week involving a stolen truck.

The teen was initially charged with possession of stolen property, but police now say she is facing six counts that include party to criminal negligence causing death.

Police have said a pickup sped through a busy intersection Monday night and hit two other vehicles, including a car that was pushed into the wall of a building.

Two 17-year-olds in the car, a boy and a girl, were killed and a 16-year-old girl was seriously hurt.

The teen, along with a 21-year-old woman who was also charged in the collision, were expected to appear in court Thursday for a bail hearing.

The second suspect, Cheyann Chrystal Peeteetuce, faces 14 counts that include impaired driving causing death and criminal negligence causing death.