JACKSONVILLE, Fla. -- A 12-year-old girl was shot in the head by an 11-year-old boy in the Lackawanna area of Jacksonville on Sunday, according to the Jacksonville Sheriff's Office.

Police said the girl was at a sleepover in the 100 block of Willow Branch Avenue. The homeowner told First Coast News that the 12-year-old girl was one of about eight children that were over for her daughter's birthday.

The victim was sleeping on the couch when she was grazed by a bullet that went through the couch and the living room wall, police said. The gun was shot by an 11-year-old boy, the nephew of the homeowner, who suffers from a mental illness. The boy is under a 72-hour mental evaluation, according to police.

The homeowner stated that this was all an accident.

According to UF Health, Rayma Eunice is currently in critical condition.

Police are encouraging anyone who has any information to call JSO at 904-630-0500 or Crime Stoppers at 1-866-845-TIPS (8477).