Authorities in Birmingham, Ala., have launched a manhunt for "multiple shooters" after they "fired upon a large group of people," killing four and 18 others.

Local and federal agents are searching for people with information about a deadly mass shooting that left four people dead and at least 18 others injured outside a Birmingham club Saturday night. The shooting happened just after 11 p.

Police say the shooters drove to the area, exited their car and fired multiple shots at a group of people before fleeing the scene. Investigators believe the shooters were paid to kill a targeted individual, who is among the four dead, according to Birmingham Police Chief Scott Thurmond.