Lethal shooting at Northern Arizona University's Flagstaff campus ends with shooter's arrest.

A lethal shooting attack took place on Friday morning at a major university campus in the southwestern state of Arizona.

One person was murdered and three others wounded to unspecified degrees in the attack, which took place at Northern Arizona University's Flagstaff campus.

After students were initially asked to stay indoors, university authorities reported that the shooter had been apprehended and was in custody.

The school announced that the "situation is stabilized" and that there was no lockdown on the campus, which is home to over 20,000 students.

The motive behind the shooting is unclear. It occurred near Mountain View Hall, a dormitory where most of the students taking part in the school's Greek organizations live.

Friday's shooting brings to mind another recent shooting tragedy in the US, in which a gunman killed nine people at a community college in Roseburg, Oregon last week.

Shooter Christopher Harper-Mercer, 26, was wounded in an exchange of gunfire with officers while standing just outside a school building at Umpqua Community College, before running back into a classroom and killing himself, the police said.

Survivors of the lethal shooting attack later said the gunman had singled out Christians, asking for his victims' religion and then shooting Christians in the head, while he shot non-Christians and those who didn't answer in the legs.