One person has been killed and three others wounded after a shooting at a university in northern Arizona.

Northern Arizona University announced on its Twitter page that a gunman had opened fire on its Flagstaff campus on Friday.

The shooting took place in a car park near Mountain View Hall, a building which houses the university's fraternities and sororities.

The suspect has been arrested, public relations director Cindy Brown said.

She said the first police calls of gunfire were reported at 1.20am. Details of what caused the shooting or the conditions of the injured people have not been released.

The college campus, which has around 25,000 students, was not placed on lockdown.