WALTHAM, MASS. (WHDH) - Police in Waltham are offering a $5,000 reward to anyone with information that leads to the arrest of the suspect who allegedly attacked 11 men over the last three weeks.

Waltham Police Chief Keith MacPherson on Tuesday said the suspect has been randomly targeting men of various races who are in their 20s, 30s, and 40s since Nov. 10.

“The person or persons responsible for these crimes appears to be lying in wait for the victims,” MacPherson explained. “Potentially selecting victims who are distracted or otherwise unaware of the attacker’s presence.”

In all of the assaults, the victims were attacked from behind with a “blunt object” and left with serious injuries including orbital and facial fractures, according to MacPherson.

The United States Postal Service confirmed that a delivery driver was one of the men attacked. USPS has since adjusted the route so deliveries take place during daylight.

“The motive is somewhat in question but it appears to be the thrill of the assault, of someone who is very violent and enjoys seeing someone hurt,” MacPherson said.

Police released video of a man who they believe is responsible for the attacks, which reportedly occurred between 5:30 and 11:30 p.m. at the Gardencrest apartment complex and in the downtown area near Chestnut and Charles streets.

Other attacks reportedly happened in the area of Middlesex Circle, Middlesex Road, and Hall Street

The suspect has been described as a Black man between 5 feet, 6 inches and 5 feet, 10 inches tall, weighing about 160 to 180 pounds and wearing black clothing.

Investigators noted that they have identified persons of interest and that drones are now being used in the search.

Mayor Jeannette McCarthy is urging residents to stay vigilant when they have to go outside.

“It’s very scary for the whole community because we’ve never had anything like this,” she said. “We’re very concerned for people that they keep their wits around them, no headphones, no cell phones…If you don’t have to go out, don’t go out. Take the dog out early, whatever you have to do.”

Anyone with information regarding the reported attacks is asked to call Waltham police at 781-314-3600 or the anonymous tip line at 781-314-3636.

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