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Several companies and services including the National Health Service in the UK were shut down for several days due to hackers.

But organisers of the Global Cyberlympics are trying improve awareness of cyber attacks by holding a hacking competition.

Teams from around the world compete yearly to be crowned the world champion.

Henri Hambartsumyan is a professional hacker and part of the current word champion team.

Caroline Barker spoke to him, and started by asking: What actually happens at the event?

Picture credit: Getty Images