Four people have been killed and dozens injured in a mass shooting in Birmingham, Alabama, police say.

“Multiple shooters fired multiple shots on a group of people” late on September 21 in the Five Points South area of the city, Birmingham police officer Truman Fitzgerald said.

Police found the bodies of two men and one woman at the scene and a fourth victim died of bullet wounds in hospital, he said.

Detectives are investigating whether the gunmen walked up to the victims or drove by, Truman Fitzgerald added. No suspects have been arrested.

The Five Points South district is known for its nightlife.

Speaking about the injured, Truman Fitzgerald told reporters: “We have dozens of gunshot victims from this area. I’m told at least four of those gunshot victims are life-threatening.”

According to the Gun Violence Archive, there have been more than 400 mass shootings across the US so far this year.

They define a mass shooting as an incident in which four or more people are injured or killed.