Residents are encouraged to stay vigilant and avoid walking alone if possible.

Minneapolis Police Department

Police released a trio of sketches they hope will help lead to the arrest of a suspected serial rapist in Minneapolis.

On Wednesday, Minneapolis PD announced that their investigation into the suspect includes numerous sexual assaults and attempted sexual assaults cases predominantly in the Marcy-Holmes and Dinkytown neighborhoods, some of them going back several years.

The suspect is believed to be a white man anywhere from 30 to 50 years old, 5'7'' to 6'0'' tall, with a medium/athletic build and he may have facial hair. It's also possible that he's shaved his head.

The sketches at the top of the story are from three recent cases, with the sketches revealing an "abrupt change" in the suspect's appearance.

Residents in those parts of Minneapolis are urged to stay aware of their surroundings, avoid walking alone and remain in areas with good lighting. Other recommendations:

Keep your cellphone charged and accessible.

Find out how your phone can make an emergency call while still being locked.

Switch up your route when walking home or to your car.

Be aware when taking out your garbage or recycling.

Keep your doors and windows lock.

Lock your car doors while inside your vehicle.

"We want people to be aware of their surroundings, particularly when they're in parking lot areas, when they're going in and out of their cars, when they're taking out their garbage and being around dumpsters," said Minneapolis Deputy Chief Erick Fors.

"Areas that are somewhat secluded and are off the normal pathway, we want people to be aware of their surroundings when they're walking by themselves."

Police did not link the suspect to any specific cases, recent nor past.

Anyone with information is asked to contact CrimeStoppers at 1-800-222-8477, or submit tips through the CrimeStoppers website. All tips are anonymous and could lead to a financial reward if the suspect is arrested.