Arlington police detectives are looking for the drivers of at least two vehicles that they say were behind a dump truck as it struck and killed a mother of three Monday.

It is unclear to what degree the drivers saw the crash that killed 39-year-old Jennifer Lawson, who was struck soon after she loaded her young daughter into a car seat in her minivan, or what insights they might provide. Police asked the drivers, who left before officers arrived, and any other witnesses to contact Detective Mohammed Tabibi of the Arlington County Police Department’s Critical Accident Team at (703) 228-4618 or

No one has been cited or charged in connection with the crash, which occurred about 11:30 a.m. in front of Nottingham Elementary School on North Little Falls Road.

A man who was in a house on the street said he heard the sound of metal on metal after the collision, which police have said was so forceful it sheared off Lawson’s minivan door.

The truck driver stayed on the scene, police have said.

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