The FBI and other federal authorities are helping police in Mississippi investigate the discovery of a severed head found on a porch.

The head of a young black man was found Saturday in Jackson. A decapitated, burned torso was found hours later in a field about a mile away.

Hinds County Coroner Sharon Grisham-Stewart says an autopsy will determine whether the head and the body were the same person. An identity has not been determined.

The body parts were found a day after a Jackson barber shop owner was shot to death in front of customers in his store.

Jackson Police Chief Lee Vance said Monday that investigators don't know whether the decapitation and the barber shop killing are connected. He calls them "shocking, bizarre, brutal (and) unacceptable."