Police are investigating reports of an active shooter at a mall in Allen, Texas.

At least one gunman is believed to have opened fire at Allen Premium outlets around 3:30 p.m. Saturday, the Collin County Sheriff’s Office told WFAA.

Collin County Sheriff’s Office confirmed to Fox4 there are “some” victims at the mall, but their status was not immediately known.

The city of Allen issued a public safety alert warning people to stay away from the area while authorities continue to investigate.

This is a developing story.