(KCEN) -- A father and his three-year-old son are dead after they and two other family members were hit by a car while walking alongside a busy San Antonio highway.
The family of four was walking on a sidewalk along I-10 and Foster Road when they were hit by a car.
The 31-year-old father was killed on impact.
His two children were taken to University Hospital where the three-year-old later died.
Their pregnant mother was also taken to the hospital.
Investigators say the driver hit a pole before running over the family.
They believe she may have been using her cell phone at the time of the crash.
So far no charges have been filed.