Officer Who Shot Unarmed Missouri Teen To Be Identified

The officer under investigation for the shooting death of unarmed Missouri teen Michael Brown will be identified within the next 24 hours, police said today.

Brown, who was African American, was shot multiple times and killed during a scuffle with a police officer Saturday afternoon in Ferguson, Mo., a suburb of St. Louis. Shell casings matched the officer's gun and he was placed on administrative leave, authorities said.

Ferguson Police Chief Thomas Jackson told ABC News he would be holding a press conference to announce the officer's name sometime within the next 24 hours, by 2 p.m. Tuesday.

Earlier today the FBI announced it had opened its own investigation into the case, in addition to the investigation being led by St. Louis County police.

"The FBI has initiated a federal investigation into a potential civil rights violation that will supplement the St. Louis Co PD inquiry. We will continue to work closely with the PD and coordinate efforts as appropriate," a spokesperson for the FBI told ABC.

U.S. Attorney General Eric Holder confirmed the FBI probe and said in a statement, "The shooting incident in Ferguson, Missouri, this weekend deserves a fulsome review." He said the FBI would be working with attorneys from the department's civil rights division.

The FBI is "reviewing" the shooting death of an unarmed teenager by a police officer, federal authorities said today.

Witness Says Missouri Teen's Hands Were Up When Cop Shot Him

Looting, Vandalism After Vigil for Missouri Man Killed by Cop

Brown's death sparked outrage in the community and across the nation. One witness, Piaget Crenshaw, told ABC News that Brown was facing the officer with his hands raised in the air when the officer shot him.

The struggle began when the officer encountered two men, one of whom was Brown, in the street outside of an apartment complex, and one of the men pushed the office back toward his squad car, according to police. A shot was fired inside the squad car and then multiple shots were fired at Brown outside the car, killing him, authorities said.

A candlelight vigil was held Sunday night in Brown's honor.

The vigil later erupted into violence, with some individuals breaking into stores and looting goods while others vandalized police vehicles. A fire broke out in a QuickTrip store that had been looted earlier.