Penn’s return has been highly anticipated in the MMA community. He had planned on fighting as part of next month’s UFC 197.

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The mixed martial arts organization released a statement Thursday:

Penn, 37, has not been charged and says the allegations aren’t true. The case is under investigation on Hilo, where the alleged incident took place, Hawaii News Now reported. An initial police report was made Tuesday in Ohio before the case was sent to law enforcement in Hawaii.

A former editor at BJPenn.com claims the fighter sexually assaulted his girlfriend.