Photo by Miki J.

Metro Transit Police arrested six teens for a fight that began at the Gallery Place station this morning, causing delays on Shady Grove-bound Red Line trains.

Metro Police Chief Ronald A. Pavlik Jr. said the incident, which happened around 8:20 a.m., started when a 35-year-old man was getting off the train and about two dozen teenagers were getting on, the Washington Post reported. Pavlik said they bumped into each other, “words were exchanged,” and one of the teens punched the man in the face. In retaliation, the victim punched back.

Pavlik said “a large skirmish happened, spilling onto the platform,” according to The Post, and the teens piled on another Red Line train. The first four teens were arrested at Woodley Park station.

Thanks @wmata for trying to keep the rest of your passengers safe while resolving the fight at woodley park. That’s a delay I’ll take.

— Liz Farmer (@LizFarmerTweets) January 28, 2016

Metro spokesman Dan Stessel told The Post that each of the suspects—five males and one female—were charged with felony assault. All of the teens are students at Wilson High School.

Metro released this video capturing part of the incident.