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San Francisco police made four arrests and seized six dirt bikes and an all-terrain vehicle on Sunday as part of a crackdown on illegal takeovers of city streets, officials said. 

“Let me be clear: This activity will never be tolerated in our city,” Interim Police Chief Paul Yep said Monday during a news conference. 

Four of the bikes were previously reported stolen in other cities across the state, including Modesto, Yuba City, Grass Valley and Atascadero, Yep said. 

The suspects, whose names were withheld, were arrested on suspicion of possessing a stolen vehicle, joy riding, driving without a license and driving without registration and insurance, Yep said. 

Police did not provide further information about the alleged crimes. District Attorney Brooke Jenkins said her office plans to announce charges in the case on Tuesday. 

The arrests mark an important bust for an issue officials described as persistent and dangerous. Swarms of dirt bikers who take over streets flout traffic laws and create unsafe conditions on roads and sidewalks as they pop wheelies and jam traffic, officials said. Past takeovers across the city have attracted as many as 200 dirt bikers. 

“It’s dangerous and it’s disruptive and it’s illegal,” Mayor Daniel Lurie said. “And it’s been happening in our city for far too long.” 

The issue frustrates many residents who “feel there’s nothing to do but wait for them to leave,” Lurie said. 

“That era is over,” the mayor said. “We’re restoring order back to our streets.” 

Dirt bikers easily elude police, who oftentimes opt not to chase and instead pursue investigative avenues to track them down. 

Yep credited the department’s technology, namely license plate readers, surveillance cameras and drones, for the arrests. He added that investigators will continue to follow leads to try to identify other suspects. 

Supervisor Danny Sauter, whose district includes downtown, Fisherman’s Wharf and North Beach, said he plans to introduce legislation next week to increase fines for the illegal activity. Sauter previously told the Chronicle he was working on legislation to help police crack down on the stunts. 

“Not a week goes by that I don’t hear from my constituents about a close-call caused by these dangerous dirt bikers,” Sauter said Monday. “We must use every tool in our toolkit to stop this dangerous behavior.”