App users tap to watch video report.

Emergency crews in suburban Philadelphia intensified their search Monday for a missing 9-month-old boy and his 2-year-old sister who were swept away in a family car when torrential rains flooded a roadway.

The two-year-old and nine-month-old have been missing since Saturday  when the car they were in was hit by flood waters in Bucks County.

Their mother was also killed.