UPDATE: Before she died, the victim was organizing a community event to combat violence.

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Three people who were driving in the car stolen from a woman killed during a fatal carjacking on Thanksgiving Day in Newark have been arrested, authorities said Friday.

According to Newark Public Safety Director Anthony Ambrose, two men and one 15-year-old boy were arrested Friday morning amid an active investigation into the killing. He commended the 1st Precinct officers -- Shahid Brown, Bennie Whadley III and Arnold Farrar -- for "an excellent job" in apprehending three of the people in the victim's car.

"Newark police officers were out looking for the vehicle since it happened," Ambrose said Friday outside a Newark police precinct. Officers spotted the car near Springfield Avenue and Jacobs Street, Ambrose said. Four people got out of the car, and after a brief chase, three were arrested, authorities said.

"It's part of the investigation," Ambrose said of the arrests, but did not say if it is known whether the men were involved in the carjacking. The Essex County Prosecutor's Office is investigating the brutal South 20th Street carjacking, which claimed the life of 40-year-old Shuri Henry, of Newark.

Henry was with her young nephew when carjackers approached and shot her, Newark Mayor Ras Baraka said Friday. She was pronounced dead at University Hospital at 11:28 p.m., officials said. Her 2015 Kia Sorrento was stolen from the scene, authorities said.

"It's really horrible that people would do this, period," Baraka told reporters. "And at this time is even worse. I'm just happy that our police department was able to act very quickly."

He called the killing "one of the most heinous things" city residents have experienced during a holiday season.

Henry was one of two people killed in separate shootings in Newark on Thanksgiving. A 46-year-old man was shot and killed near 400 South Orange Avenue earlier Thursday, authorities said.

This story has been changed to reflect corrections to information in early releases from authorities about this incident.

Jessica Mazzola may be reached at jmazzola@njadvancemedia.com. Follow her on Twitter @JessMazzola. Find NJ.com on Facebook.