Two teenage boys have been charged with murder after the shooting at a 16th birthday party in Alabama that killed four and injured 32 over the weekend.

Brothers Ty Reik McCullough, 17, and Travis McCullough, 16, were arrested on Tuesday night, and are each being charged with four counts of reckless murder and that more charges are expected. 

At a press conference on Wednesday, officials told reporters that these were the early stages of the investigation into the shooting on Saturday in Dadeville, Alabama.

Hours later, police announced the arrest of a third suspect, Wilson LaMar Hill, 20, is facing the same charges as the two boys, who prosecutors say will be charged as adults.

No information was given about a motive or the type of firearm used.