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Editor's note: This gallery contains graphic images. Viewer discretion is advised.

Ten people were shot in a mass shooting on the New York subway Tuesday morning, authorities said.

A male train passenger put on a gas mask, deployed smoke grenades and then opened fire inside a subway car, according to New York City Police Commissioner Keechant Sewell. The incident happened as a Manhattan-bound train was waiting to enter the 36th Street subway station in Brooklyn at 8:24 a.m.

People were struck by bullets on the subway car and on the subway platform, Sewell said, adding that there were no life-threatening injuries. At least 19 other people were treated for injuries that weren't gunshot wounds, according to hospital representatives.

A 62-year-old suspect, Frank James, was arrested Wednesday afternoon in New York's East Village neighborhood. He was charged in federal court with violating a law that prohibits terrorist and other violent attacks against a mass transportation system, according to Breon Peace, US Attorney for the Eastern District of New York. James appeared in court Thursday and did not enter a plea.

Police and emergency responders gather outside the 36th Street subway station in Brooklyn, New York, on Tuesday, April 12.

Spencer Platt/Getty Images

Injured people are seen on the platform of the 36th Street subway station on Tuesday. This photo was taken by photojournalist Derek French, who told CNN he leveraged his Red Cross first aid training to help victims. While helping them, French also discovered that he himself had been shot in the ankle and was bleeding. Editor's note: A blur has been applied here by CNN to protect the identity of the victim.

Derek French/Shutterstock

Emergency personnel work at the entrance to the subway station.

John Minchillo/AP

A New York City police officer checks security cameras near the scene.

Andrew Kelly/Reuters

Emergency personnel respond to the scene.

John Minchillo/AP

People look out of a home near the scene of the shooting.

Brendan McDermid/Reuters

The mass shooting comes amid a rise in shootings in New York over the past two years and a particular rise in violence on the subway that has become a focus of Mayor Eric Adams' administration.

John Minchillo/AP

Injured people are seen in the subway station on Tuesday. <strong><em>Editor's note:</em></strong><em> A blur has been applied by CNN to the faces of the victims to protect their identities. </em>

Injured people are seen in the subway station on Tuesday. Editor's note: A blur has been applied by CNN to the faces of the victims to protect their identities.

Armen Armenian

Brooklyn's Sunset Park neighborhood is located in the southwest part of the borough.

Kevin Hagen/AP

New York City Police Commissioner Keechant Sewell speaks about the shooting at a <a href="index.php?page=&url=https%3A%2F%2Fwww.cnn.com%2Fus%2Flive-news%2Fbrooklyn-subway-shooting-nyc%2Fh_a41e4ad5baa7b3ff9809cdd3f89aad66" target="_blank">news conference</a> on Tuesday. "We are determining what the motive is, and we will find that out as the investigation continues," she said.

New York City Police Commissioner Keechant Sewell speaks about the shooting at a news conference on Tuesday. "We are determining what the motive is, and we will find that out as the investigation continues," she said.

Angela Weiss/AFP/Getty Images