4 killed, 18 injured in mass shooting at popular Birmingham, Alabama neighborhood

BIRMINGHAM, Ala. -- Four people were killed and more than a dozen were injured in a shooting in Birmingham, Alabama, on Saturday night.

Police said officers responded to reports of a major shooting. "Officers are on the scene of multiple people shot with possibly multiple casualties," the Birmingham Police Department wrote in a post to X.

The shooting occurred in the Five Points South area of the city, the post added.

ABC News Birmingham affiliate WBMA reported that at least four people were killed and dozens injured in the shooting. At least four of the injured have life-threatening injuries, WBMA said.

As of 6 a.m. CST on Sunday, officials say 18 others were also hurt during the shooting. Their injuries range from non-life-threatening to life-threatening.

WBMA said the shooting occurred around 11 p.m. Saturday night in the busy Five Points South area.

Three of the four victims died on the scene, WBMA said. The fourth victim died at the hospital.

Investigators said they made no arrests and believe there were multiple shooters who fired upon a large group of people who were outside in a public area in the 2000 Block of Magnolia Avenue South.

Police are investigating whether a gun fitted with a so-called "switch" -- which allows a semi-automatic weapon to fire at a faster rate -- was used in the shooting, WBMA said.

The Birmingham Police Department has requested FBI and ATF assistance with the investigation, WBMA reported. Authorities are also seeking information from witnesses as they work to determine who were the intended targets of the shooting.

"There is no greater resource than the public," Birmingham Police Officer Truman Fitzgerald said. "We will do everything we possibly can to make sure we uncover, identify and hunt down whoever is responsible for preying on our people this morning."

This is a developing story. This article will continue to be updated as more information becomes available.

ABC News' Jessica Gorman contributed to this report.