An investigation is taking place involving a police officer who shot a person who was allegedly coming at them with a knife in north Alabama.

Authorities in Birmingham, Alabama, are offering a combined reward of up to $100,000 dollars for information to help identify multiple people who opened fire in a bustling entertainment district Saturday night as part of what they called a targeted “hit” that left 4 dead and 17 injured – including many bystanders caught in the barrage of bullets.