WASHINGTON (AP) — A shuttle bus transporting a group back from a birthday party collided with a car and overturned before dawn Sunday along a highway south of the nation’s capital, leaving one person dead and sending 16 others to the hospital, Virginia State Police said.

The bus was headed south on Interstate 95 when witnesses reported seeing a speeding white sedan swerve into the bus’s lane. Virginia State Police initially said the bus swerved to avoid the car and then overturned, but later said the two vehicles collided, causing the bus driver to lose control, drive off the road and overturn.