A United States teenager shot his 13-year-old sister in the back of the head after she gave him a birthday hug in their Florida home.

According to the police, 17-year-old Martaevious Santiago pointed a loaded semi-automatic handgun at Tedra King as she walked away and pulled the trigger, killing her. He claimed it was an accident.

Reports said Martaevious called police after the shooting and said he had accidentally shot his sister.

He has been charged him with aggravated manslaughter of a child and possession of a weapon during the commission of a felony.

The 17-year-old told the police he got the gun from a 14-year-old friend, who has also been arrested.