Gwinnett County police released a sketch of a man suspected of sexually assaulting a woman in her car after abducting her near Lawrenceville last week.

Authorities were called to Gwinnett Medical Center about 10 p.m. July 30 after a 24-year-old woman reported to hospital officials she had been assaulted.

The woman was driving home from work around 8:30 p.m. on Lawrenceville Highway heading toward Lawrenceville when her car was hit from behind by a dark-colored vehicle at a stoplight, according to Gwinnett police. When she got out the car, a man wearing a white sleeveless shirt pulled out a handgun, forced her back into her car, and made her drive away from the scene.

The woman told police she was sexually assaulted in her car after turning onto an unpaved, unidentified street. When the man was finished assaulting her, he got out of the car and walked away, after which she drove herself to the hospital.

The suspect is described by police as a white man between the ages of 25 and 40 with short, dark hair, a tan complexion and a muscular build.

Anyone with information about the incident is asked to contact Gwinnett detectives at 770-513-5371 or 770-513-5300. People can submit anonymous tips online or by calling Crime Stoppers at 404-577-8477. There is a reward of up to $2,000 for information leading to the arrest and indictment of the suspect.