BRAZILIAN jiu-jitsu Amanda Mazza snapped her OWN arm while attempting a submission.

The American grappler faced Emily Hansen at CFFC BJJ 15 in Philadelphia.

Mazza took Hansen's back in the search for a rear-naked choke.

But as Mazza tightened her grip, she accidentally snapped her own arm, declaring Hansen the winner.

Fans were in shock by the astonishing incident as one said: "Wow. Never seen that."

Another added: "Did not know that could happen."

One commented: "New fear unlocked."

Another said: "Talk about a plot twist."

Mazza spoke out on Instagram after the freak injury to thank fans.

She posted: "Thank you everyone for the love & sweet messages. I'm still smiling & will be back & better.

"That mat return though. Damn I felt good out there. So good I didn't even feel my arm

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