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"They were questioned as witnesses and later their identities were fully confirmed via social networks, mobile phones, and partial radio intercepts that preceded the event. The entire unit in that sector was tracked."

Three teenage girls have pleaded guilty at the Old Bailey to the manslaughter of a 75-year-old man who died after a street attack that was filmed on a mobile phone.

A large crowd was behind them, filming on mobile phones rather than intervening.

Following an interview with Mr Banta, police collected his mobile phone, but later discovered "crucial evidence relating to the case" was deleted, they said.

It was a final so engrossing that the Spanish national football team huddled around a mobile phone to watch before their Nations League meeting with Portugal.