New photos of ATV riders could help police in Maryland crack down on the illegal activity.

Prince George’s County Police said the riders were spotted in the National Harbor area last Sunday. Some of them were on the road, while others were driving on the sidewalks.

All of it was illegal. Riding ATVs and unlicensed dirt bikes on county roads is against the law.

This is the same group of riders that frustrated police and terrified bystanders last weekend. The crew of upwards of 70 riders started in D.C. They drove up the busy H Street corridor, popping wheelies, blasting through red lights, and weaving in and out of traffic.

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However, both D.C. and Prince George’s County Police have “no chase” policies in this situation.

"We will not meet reckless behavior with our own reckless behavior," said Deputy Chief Chris Murtha, with Prince George's County Police.

D.C. police put out hundreds of photos of 54 suspects wanted in last weekend’s barrage of dirt bikes and ATVs. You can see all of the photos here.

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So far this year, DC officers have arrested 21 people for driving the illegal vehicles. It’s against the law to ride ATVs and dirt bikes on any public space in the District.

Prince George’s County Police also said they are working on releasing more photos.

If anyone recognizes the riders, Prince George’s County asked tipsters to call 1-866-411-TIPS. D.C. police are offering a $250 reward for information by calling (202) 727-9099 or texting 50411.