WICHITA, Kan. (AP) -- Wichita police say a man they thought was posing as a Kansas Highway Patrol trooper during a weekend traffic stop was really an off-duty Sedgwick County sheriff's deputy.

Police spokesman Sgt. Scott Brunow told The Wichita Eagle (http://bit.ly/QDTk8W) Sunday he had no other details about what happened at 1 a.m. Saturday.

A city officer thought he had come upon a routine traffic stop by the Highway Patrol and pulled up behind what looked like an unmarked state trooper's car to provide backup.

The officer conducting the traffic stop bolted back to his car, flipped on his lights and sirens and sped away. The woman he had stopped also drove away.

Afterward, the Police Department issued a warning about a fake, heavyset patrolman wearing a loose-fitting uniform making traffic stops.

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Information from: The Wichita Eagle, http://www.kansas.com