PHILADELPHIA (AP) - Police say charges have been filed against the driver of a sport utility vehicle that rear-ended another vehicle and then struck a pregnant woman sitting on a wall in north Philadelphia, killing her baby and critically injuring her.

Police say two vehicles were "engaged in a street race or chase" at high speed past the Temple University campus on Broad Street just before 5 a.m. Monday. They say a sport utility vehicle rear-ended the other vehicle, which hit a tree, and the SUV jumped the curb and struck a woman sitting with two males on a low concrete wall.

Police said the 27-year-old woman, who was seven months' pregnant, was taken to Temple University Hospital, where her baby was delivered and later pronounced dead just before 9:30 a.m. Monday. The woman was listed in extremely critical condition. Six passengers in the vehicles were seriously injured.

Police said Tuesday 19-year-old Yaaseen Bivines was charged with 3rd- degree murder of an unborn child as well as aggravated assault, driving under the influence and other counts. He was ordered held on $1 million bail. It's unclear whether he has an attorney and a listed number for him couldn't be found Tuesday.