A deadly shooting has occurred on the campus of Northern Arizona's Flagstaff campus earlier this morning. According to a university spokesperson, the suspected shooter is in custody.

One person died and three others were wounded in the shooting, the spokesperson said.

It is unclear what sparked the shooting, which took place near Mountain View Hall, a dormitory that houses most of the campus' students involved in Greek organizations.

Those residents were encouraged to stay indoors while the investigation continues.

A later tweet summed up the happenings of the morning.

This is not a small university either. There are more than 20,000 students enrolled at the Flagstaff campus.

Our condolences to the family of the victims.

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