Maine State Police said a young mother was killed this afternoon when her car crossed the center line and collided with an oncoming car on Route 1A in Frankfort. 

The woman's three-year-old son was injured while in his car seat in the back.  Troopers said 34-year-old Teresa Sirois, of Brooks, died at the scene. 

Her son, Damian Sirois, was transported to Eastern Maine Medical Center in Bangor with non-life-threatening injuries.

The driver of the other car, Randall Pukay, 53, of Bucksport, also was injured and taken to EMMC. 

Troopers are now trying to determine why Sirois' car went into the other lane.  The crash took place about 4:45 p.m. and the crash site was cleared about 8:30 p.m., police said.

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