UPDATE: Police have confirmed that a group of girls popping balloons caused the panic that led to the "run, hide, fight" alert being issued.

UPDATE: Just after 5:30 p.m. on Saturday, the University tweeted that "there does not appear to be an active threat to the community, but that authorities were continuing to investigate the situation.

ORIGINAL STORY: The University of Michigan sent out an emergency alert Saturday, March 16 around 5 p.m. for all students in and near Mason Hall to "Run, Hide, Fight".

The university's Department of Public Safety website states that there have been "unconfirmed reports of an active shooter."

This is a developing story.