This just in from the Dallas Police Department:
On September 19, 2010, at about 12:30 am, the pictured suspect was seen by a complainant performing a traffic stop in an unmarked, black Ford, 4 door sedan, at Lemmon Avenue and Wycliff Avenue. The complainant suspected that the suspect was not a police officer and began to follow the suspect in order to obtain the license plate of the suspect vehicle. The suspect vehicle came to an abrupt stop at 3700 Rawlins, and the suspect confronted the complainant. When the complainant questioned the suspect's identity, he replied by saying, "I am a U.S. Marshal."
The suspect then drew a black semi-automatic handgun, with laser sights, and pointed it at the complainant's head. The suspect then fled the location in the suspect vehicle, and he remains at large.
The Dallas Police Department is trying to identify this suspect and also would like to speak with the citizen the suspect had pulled over at Lemmon and Wycliff. Anyone with information regarding the listed suspect or this incident, please contact the Dallas Police Department Crimes Against Persons Division at 214 671 3616 or call 9-1-1. This suspect is considered armed and dangerous.
The suspect is described as a 30-year-old(ish), 5-foot-11(ish) white male with brown hair and brown eyes. And, last seen, he was driving a black four-door Ford with LED lights on the dash. A photo of that follows.