THIS is the astonishing moment a "jewellery thief" is wrestled to the ground and held in a "lion killer" chokehold by tourists.

Brazilian brothers Gabriel and Gustavo Galindo sprung into action after hearing screams from a man claiming he had been robbed .

Both black belts in Jiu-Jitsu, the siblings quickly put the alleged thief into a "lion killer" chokehold - a popular martial art move that can, in some instances, be deadly.

When police arrived 10 minutes later to escort the man away, applause and cheers erupted for the two brothers.

Shocking footage shows the man pinned to the ground as he attempts to wriggle out of the stranglehold.

According to Brazilian news , the alleged thief tried to bite Gabriel before being warned to "stay still" or leave without an arm.

Gabriel said

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