Officials have announced up to $100,000 in reward funds for information leading to the arrest of the gunman or gunmen behind a mass shooting in Birmingham, Alabama.

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.