IOWA CITY (AP) — A University of Iowa graduate student who was fatally shot after he opened fire on police was granted a handgun permit only after his psychologist assured the sheriff that he posed no safety threat, according to records released Tuesday.

Johnson County Sheriff Lonny Pulkrabek declined to talk about the investigation into Sunday’s shooting in which 28-year-old Taleb Salameh shot and injured three police officers responding to a domestic disturbance at a North Liberty trailer park. He said Salameh died at the scene and that an autopsy will determine the cause of death.

But Pulkrabek spoke openly about the background checks the sheriff’s office made in response to Salameh’s February 2010 application to purchase a firearm, calling it a “great example” of why the university and his office worked together to vet applicants.