Indiana University on lockdown, warns of gunman

Authorities put Indiana University on lockdown early on Sunday and warned students that an armed person was on campus, CNN reported.

"Armed individual at large on campus. Take shelter in nearest room," the university said on its Twitter account.

The incident was taking place at its Bloomington campus, the university said.

"All of campus should be considered in danger. Anything more specific is just speculation," the university tweeted.