Scotland Yard says it has received intelligence that organised gangs from South America and Eastern Europe are planning a crime blitz during the Olympic Games.

Some gangs are already in the UK, fuelling a surge in petty crime.

A number of police operations have been launched to tackle these gangs, raiding their homes and targeting suspects on the streets.

Chris Rogers travelled to Barcelona, a hotspot for "career pickpockets", where he found a Romanian gang who claim they are planning to target Olympic tourists.