A Reading police officer was struck by a passing pickup truck while conducting a traffic stop Saturday night, and police are asking for the public’s help in finding the driver, authorities said.

Reading Police Chief David Clark said the officer had stopped a car near 326 Lowell St. at Willow Street when they were struck in the corner by the side mirror of a passing pickup truck shortly before 7:30 p.m. The truck continued east on Lowell Street and turned south on Willow Street, Clark said.