The gun was owned by Arizonan Jesse Kitagawa Jr., 45, who allegedly sold it to a suspected California gunman, 56-year-old Glenn Litton, police said.

The gun used to critically injure two elementary school students in Butte County was a modified weapon — also known as a ghost gun — the shooter bought from a felon in Arizona, officials said Tuesday.

Jesse Kitagawa Jr. of Arizona was arrested and accused of unlawfully selling the handgun to Glenn Litton, who allegedly used it to open fire at a California school.