The video captures a disturbing sequence: A woman can be seen walking along a sidewalk in the Bronx on an early May morning, when a man, his face covered, approaches from behind. He throws a looped belt around the woman’s neck and yanks her to the ground. She loses consciousness. He drags her in between two parked cars.

Then, police said, he sexually assaulted her.

The scenes captured on the video sowed fear among many residents of the South Bronx. On Saturday, the police said they had arrested a man — Kashaan Parks, 39, also of the Bronx — in connection with the assault.

Mr. Parks faces several charges, including rape, assault, strangulation, sex abuse and harassment. The police said Mr. Parks had been arrested two other times: Once in 2018 for domestic assault, and in 2013 for theft of service in the transit system. It was not immediately clear if there was any connection between Mr. Parks and the woman.

The incident took place around 5 a.m. on May 1 near the intersection of East 152nd Street and Third Avenue. The woman, who was not named, went to Lincoln Hospital in the South Bronx after the attack. She did not report the assault to the authorities, Joseph Kenny, the chief of detectives for the Police Department, told reporters at a briefing on Friday.

The police learned about the assault when they saw the footage caught on security cameras that was being shared online, Chief Kenny said.

Officers tried to determine where the video came from, he said. Then an officer from a Bronx precinct where the woman was assaulted realized they already knew where the victim was: in police custody for an unrelated minor offense, Chief Kenny said.