Gunfire on Amtrak Train: D.E.A. Agent Killed, 2nd Agent Is Critically Wounded

A suspect was dead and a Tucson officer wounded in the shooting, which erupted during a drug sweep of the train at a stop in Arizona, the police said.

Ex-Marine Sharpshooter Kills 4 and Fires at Deputies in Florida, Sheriff Says

The gunman, a veteran of the wars in Afghanistan and Iraq, fatally shot a man, two women and an infant inside two homes near Lakeland, Fla., the authorities said. A girl, 11, was wounded.

Revealing His Identity, Capitol Police Officer Defends Shooting Rioter on Jan. 6

“I know that day I saved countless lives,” Lt. Michael Byrd said in an interview with NBC. He said shooting Ashli Babbitt, who smashed through a door near lawmakers, was a “last resort.”

Hong Kong Police Arrest Students Over ‘Advocating Terrorism’

The student union leaders, who were detained under the national security law, had expressed sympathy for a man who stabbed a police officer before killing himself.

How a Respected N.Y.P.D. Officer Became the Accused Capitol Riot #EyeGouger

Thomas Webster once was part of Mayor Bloomberg’s security detail. As he awaits trial, the retired cop is on the other side of the law.

An Officer Stabbed. A Bomb Plot Foiled. A Specter of Violence Divides Hong Kong.

Six teenagers were among those arrested in connection with a bomb plot. Some democracy activists say Beijing’s crackdown is fueling radical ideas.

Bystander Who Intervened in Shooting of Officer Was Fatally Shot by Police

The police in Arvada, Colo., said a good Samaritan who fatally shot a gunman who had just killed a police officer was himself shot by responding officers.

Protester Who Crashed Into Police Faces Hong Kong’s First Security Law Trial

Tong Ying-kit, who hit officers while riding a motorcycle with a protest flag, is accused of terrorism and inciting secession. He could be sentenced to life in prison.

Whose Park Is It? Residents and Revelers Clash Over Washington Square.

As the pandemic eases, the park has attracted crowds of young people who regard it as a place to let loose. Residents say the scene is out of control.

F.B.I. Is Pursuing ‘Hundreds’ in Capitol Riot Inquiry, Wray Tells Congress

In two separate hearings, the F.B.I. director and Pentagon officials answered questions about the failure to adequately prepare for and respond to the Jan. 6 attack.