Ivan Skoko, a 15 stone black belt Brazilian jiu-jitsu expert, leapt into action when he witnessed an armed phone thief target a young woman on the Tube and used his martial arts background to stop him View 4 Images Ivan restrained the man on the tube platform (Image: @skokoi_/Instagra)

An armed phone thief suspect was tackled by a have-a-go-hero when he targetted a tube passenger — in front of a champion martial artists. Quick-thinking Ivan Skoko leapt into action when he witnessed the man grab a young woman's device on Tuesday.

The 15 stone Brazilian jiu-jitsu black belt wrestled the suspect to the ground by his hoodie and placed him in an arm lock within seconds. He then restrained the would-be thief on the platform at the busy Borough Station in South London until cops

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