Police officials shared more details about the Brownsville, Brooklyn subway station shooting during a Wednesday evening news conference. They said the violence, captured on body-worn cameras and 15 surveillance cameras at the station and on the trains, began when a man accused of fare evasion later charged at police with a knife.

Nearly 20 people were arrested in a protest that spawned at a Brooklyn subway station where four people were shot, including two bystanders, when NYPD officers opened fire during a confrontation with an alleged fare-beater over the weekend,

The Brooklyn man who allegedly charged at police officers with a knife on Sunday had already had one interaction with police for reportedly dodging the MTA fare, the NYPD said. NYPD Interim Police Commissioner Thomas G.