The police said that Anthony Brennan III, 60, of Kensington, Md., was arrested after investigators received hundreds of tips from people who had seen a video of the encounter.

The fliers, described as a call for community action, read: A man was lynched by the police. What are you going to do about it? according to Captain Jeffrey Coe, a spokesman for the Maryland-National Capital Park Police.
Mr. Brennan began to argue about the fliers and forcibly grabbed them from one of the teenagers, the police said. He then pushed his bicycle toward another one of the teens and caused him to fall to the ground, the police said.
The encounter happened as thousands of demonstrations against police violence and racism have raged across the country in the days since George Floyd, a black man in Minneapolis, died after a white police officer knelt on his neck.
In the video, the cyclist, wearing bike shorts, a bike helmet and sunglasses, walks toward a young woman with papers in his hand, while another woman yells, Do not touch her! and a man yells, Leave her alone! The cyclist grabs the womans arm roughly, before another woman pushes him away, yelling, Get off of her! The cyclist then grabs his bike and charges at the young man recording the encounter, who falls to the ground.
Mr. Brennan of Kensington, Md., faces three counts of second-degree assault.Credit…Maryland-National Capital Park Police
The Maryland-National Capital Park Police said that detectives used various sources to corroborate information provided by the community before identifying Mr. Brennan as the primary suspect. After contacting Mr. Brennan and his lawyer on Friday, the police said, they got his permission to search his home, where they seized evidence.