Metro

Two dead in Atlanta following shooting at rap concert featuring Dorchester artist

Cousin Stizz performed at Boston Calling earlier this year.
Ben Stas for The Boston Globe/File
Cousin Stizz performed at Boston Calling earlier this year.

Two people were killed Sunday at a concert in Atlanta featuring Dorchester rapper Cousin Stizz, police said. Two others were wounded.

Shots broke out when two people climbed onto the stage at The Masquerade at Underground Atlanta, according to Lisa Bender of the Atlanta Police Department. One patron was pronounced dead at the scene, and another died at the hospital. The two people who were wounded are expected to survive.

Shortly after the shooting, Cousin Stizz wrote on Twitter that he was “completely heartbroken.”

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‘‘Before I hit the stage in Atlanta tonight, there was a shooting in the crowd, two people died and two others were injured,’’ he wrote. “I’m in shock and at a loss for words for the senseless violence.’’

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Stizz postponed his show in Washington, D.C., Monday because of the shooting.

“There will be a new date rescheduled for the near future,” he wrote.

Stizz, who played Boston Calling in May 2017 and won several nominations (including Artist of the Year) at the Boston Music Awards, is set to play Nov. 24 at the House of Blues.

Authorities continued to search for the gunman Monday.

Material from the Associated Press was used in this report. Aimee Ortiz can be reached at aimee.ortiz@globe.com. Follow her on twitter @aimee_ortiz.