Multiple people opened fire Saturday night in a bustling area of Birmingham, Alabama, killing four people and injuring 17 others. Police had not made any arrests as of Sunday evening.

In a new conference Sunday morning, Birmingham Police Chief Scott Thurmond says he believes someone was paid to kill the targeted victim, and they believe that victim is among those who died. Police confirmed the weapons used were fully automatic. More than 100 shell casings were found at the scene, according to Chief Thurmond.