Two teenage brothers are among six people accused of carrying out a deadly shooting at a Sweet 16 birthday party in Alabama, authorities announced. Four young people were killed in the shooting late one Saturday night at a dance studio in the town of Dadeville, Alabama.

A 15-year-old from Tuskegee was arrested Thursday morning, after the initial incident.

Also arrested Thursday was 19-year-old Willie George Brown Jr. and 20-year-old Johnny Letron Brown.

On Tuesday, agency officials announced the arrest of brothers identified as Ty Reik McCullough, 17, and Travis McCullough, 16, both of Tuskegee. Another man, 20-year-old Wilson LaMar Hill Jr., was arrested.

The suspects were each charged with four counts of reckless murder, the agency said. District Attorney Mike Segrest said the two brothers would be charged as adults. News typically does not name suspects who are minors unless they’re being charged as adults with serious crimes.

All of the deceased victims in the mass shooting were under the age of 24. The victims were identified as Marsiah Collins, 19; Phil Dowdell, 18; Corbin Holston, 23; and Shaunkivia Smith, 17.

Another 32 people were hurt in the shooting. Segrest said four people were still in critical condition and that additional charges would be filed against the suspects.

The district attorney noted that the birthday party was for Dowdell’s sister, Alexis Dowdell.

The Alabama Law Enforcement Agency said Thursday that five of the six suspects have been booked into the Tallapoosa County Jail with no bond, with the exception of the 15-year-old suspect. 

The investigation into the shooting was ongoing, and detectives said they couldn’t discuss a possible motive for the attack or a possible connection between the suspects and the victims.

Investigators urged people who were at the party and haven’t already contacted investigators to reach out to authorities.