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Former Olympic sprinter Roger Black was on the edge of his seat as he watched Mo Farah competing in the Men's 5,000m final at the IAAF World Championships:
British Athletics said Mo Farah's second gold at the IAAF World Championships in Moscow "really cements his place in the history books."
The body also urged people to retweet one of its messages if they think Farah "is the greatest British athlete of all time":
Olympic champion Mo Farah showed off his second gold medal after winning the Men's 5,000m finals at the IAAF World Championships in Moscow.
Paralympic champion David Weir as well as Olympians Lutalo Muhammad and Jo Pavey have tweeted their support to Mo Farah, after he became the second man in history to hold the 5,000 and 10,000 Olympic and World Championship titles.
Mo Farah said that it was "hard work" winning today's 5,000 metre final at the World Championships, adding that it was "harder than the last".
He told the BBC:
Former Olympic sprinter Roger Black has told ITV News that the UK is "witnessing the greatest British athlete we have ever seen", after Mo Farah won his second gold medal at the World Championships today.
Manchester United footballer Michael Carrick and former Olympic hurdler Colin Jackson have called Olympic champion Mo Farah's win at the 5,000 metre finals in the World Championships a "class performance".
Mo Farah's wife Tania says she is "overwhelmed" after he won a historic second gold in the 5,000m at the Moscow World Athletics Championships.
She said watching the race was more nerve-wracking than watching the Olympics, because of the level of expectation. She spoke to reporter Rags Martel.
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Mo Farah is hailed as Britain's greatest ever athlete after repeating his Olympic success with a double victory at the World Championships.
He won two Olympic gold medals last year and has already won gold this year in the 10,000 metres but is he the greatest of all time?