A North Carolina man was partially paralyzed after he was struck in the head on Saturday by a stray bullet at a festival celebrating the opening of a Buddhist temple in Charlotte, N.C., WSOC-TV reported.

Brandon Yam was serving food at the festival when a stray bullet fell from the sky, according to WSOC.

“We heard a pop and turned around and my dad was frozen,” his son Randy Yam told WSOC.

Investigators believe someone shot a gun into the air near the temple, potentially celebrating the Fourth of July.

Yam is being treated at the Carolinas Medical Center. His condition is improving, but he cannot move the left side of his body and struggles with speech, according to WSOC.