A 12-year-old girl was shot in the head by a stray bullet while sitting in her living room in Long Island yesterday.

The girl, who Newsday has identified as Dejah Joyner, was sitting in her Hempstead home when a bullet came through a first floor window around 5 p.m. Friday. "It’s a single shot, we’ve determined, that came from the street in front of that location," said Det. Sgt. James Skopek.

She was transported to Winthrop-University Hospital in serious condition. It's unclear what caused the shooting, but police say she is not believed to be the intended target.

"The child was shot once in the brain, and she's currently in grave condition," Nassau acting Police Commissioner Thomas Krumpter said at a news conference. He called it a "heinous criminal act...committed by a despicable human being." He added that there were no suspects right now, and the investigation is ongoing.

"The father was very upset. What happened to his daughter is a tragedy and words can't explain how he feels," Hempstead School Board president Lamont Johnson told Newsday. "Everyone feels like a 12-year-old child in their own home should feel safe, and there's too much violence. Everyone says enough is enough of this senseless violence."

The victim's grandfather, David Joyce, told ABC, "Beautiful girl, a beautiful personality. I don't know anything right now—I haven't heard anything."

Nassau Police request anyone with information regarding the incident to contact Nassau County Crime Stoppers at (800) 244-TIPS.