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BEDFORD, N.Y. — A mother and her 3-year-old son were killed in a crash after a Bronx man skidded on the road and struck a stopped car, police said.

Henry Valencia, 59, was driving a box tuck on southbound Interstate 684 Saturday afternoon when he was unable to brake because of icy road conditions, a New York State Police spokesperson said. His truck struck another car. It set off a chain reaction involving four other vehicles.

The driver of the car Valenica hit, 40-year-old Kerry Hamill, was killed in the crash, police said. Her 3-year-old son in the vehicle was also killed. Hamill’s wife survived the crash. She suffered minor injuries and was treated at a local hospital.

Occupants of the other vehicles involved were taken to local hospitals for treatment of minor injuries, police said.

Correction:  An earlier version of this article incorrectly described the 40-year-old victim as a man.