ANTIOCH — An Antioch police officer shot and killed a man who was allegedly armed with a knife on Monday morning, according to authorities.

The man, who has not been identified, was 26 years old. Police haven’t identified the officer who killed him, but authorities say he was a recent hire in the department.

At about 7:15 a.m. Monday, officers responded to a call on the 3800 block of Osprey Drive in southeast Antioch about a person threatening to “kill everyone in the home” with a knife, police said. When officers arrived, they allege the man charged at them with the weapon, and that one officer responded by firing at the man.

A woman at the scene, believed to be a member of the man’s family, was later seen fainting during a conversation with police investigators.

Police remained on Osprey Drive, which is above James Donlon Boulevard, into the afternoon processing the scene. The house is in a neighborhood of middle-class homes with fire-scarred hills surrounding them from the Somersville Fire, a blaze that burned 358 acres earlier this month.

“Those two things less than a month apart, and before that for 13 years I’ve lived here, nothing happened,” resident Domingo DaRosa said. “It’s a great neighborhood. I rarely see police out here, because there are rarely problems in the neighborhood.”

The officer who fired his duty weapon has been sequestered, per a standard countywide protocol for fatal law enforcement incidents. The Contra Costa County District Attorney and Sheriff’s offices were brought in for a third-party investigation.