State Police report arresting a woman they say drove into two women and three children around 5 p.m. at Rte. 145 near North Shore Road. One child, 5, died, State Police say.

Autumn Harris, 42, of Beacon Hill, is expected to be arraigned on charges of motor vehicle homicide and negligent operation of a motor vehicle in Chelsea District Court, the Suffolk County District Attorney's office reports.

State Police say an infant, 2 months, was taken to Mass. General Hospital with life-threatening injuries. The other child, 2, was taken to the hospital with injuries not considered life threatening, as were the two women.

State Police add a woman in the car was taken to the hospital with injuries not considered life-threatening.

Preliminary investigation indicates all five victims were together in the median which divides both sides of Route 145. They were at the crosswalk in the median apparently waiting to cross when struck. We have the female operator under arrest at the State Police-Revere Barracks. Investigation is ongoing to determine scope of charges. We are responding a drug recognition expert to the barracks to assess the operator for potential impairment by narcotics.

The suspect's name has yet to be released.