Olympic champion Mo Farah has pulled out of today's 1500m race at the Diamond League event in Birmingham saying he is "emotionally and physically drained".
"This week has been very stressful and taken a lot out of me. I have not been able to focus properly on today's race," Farah said in a statement.
"I want to run well in the IAAF World Athletics Championships in Beijing and have decided it is better for me to go back to the US, seek answers to my questions and get back into training."
"I apologise to the people who bought tickets to come and watch me race and ask for your understanding at this time."
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Double Olympic Champion Mo Farah is back on the track at the former Olympic Stadium later today.
The athlete is returning to the ground where he won gold in both the men's 5000 and 10,000 metres titles to launch the Anniversary Games.
Ticket registration for the games opens at the beginning of next week.
Somalia born Mo - who grew up in Hounslow - represented Great Britain in the Olympics, winning two gold medals - and is also the 10,000m and 5,000m world and European champion.
Mo and his wife Tania set up the Mo Farah Foundation in 2011 which is a charity focussed on health improvement, education and poverty in the horn of Africa and the UK.
He's organising a big charity ball on Thursday night for the Foundation before heading up for the Great North Run.
Londoner Mo Farah will represent England defending his titles in the 5,000m and 10,000m at this summer's Commonwealth Games in Glasgow.
London's own wheelchair racing star David Weir will try to break the world record for the fastest mile today - aiming to beat three minutes on the 60th anniversary of Roger Bannister's four minute mile.
He is racing as part of the Bupa Westminster Mile event - a one day festival of mile and track racing in the capital. Sir Roger will be there himself to watch the race and present prizes.
Mo Farah will fire the starting gun at some of the afternoon's races - before looking to claim another victory of his own in the Bupa London 10,000 race on Sunday morning.
A new wax figure of double Olympic champion Mo Farah has been unveiled at London's Madame Tassauds.
Farah is portrayed in his trademark "Mobot" pose and is wearing a Team GB athletics kit.
“It’s brilliant – it’s weird to see myself like this but they did a great job, they look exactly like me. Even my kids are shocked!” the long distance runner said.
The unveiling comes just two days after Farah finished eighth in his first London Marathon.
Double Olympic gold-winning track star Mo Farah is to be turned into a waxwork by Madame Tussauds.
The attraction is preparing a figure of the runner in his "mo-bit" pose, which will be placed alongside other sporting stars such as sprinter Usain Bolt, diver Tom Daley and heptathlete Jessica Ennis.
He said: "I saw Usain Bolt's wax figure at the Anniversary Games last year and couldn't believe how brilliant it was. I said then that I'd love one of my own and I'm so excited that it's now really happening."
Olympic champion Mo Farah has revealed how he got into a "fist fight" with a man who kept blocking his path during a Christmas Day training session in 2009, according to the Evening Standard.
Revealing the incident in his autobiography, which was published yesterday, Farah said: "I was running up and down repeatedly on this one hill when I noticed a couple with a baby in a pushchair walking up the same hill.
"They were taking up nearly the entire path. After three or four attempts to run around the couple I got a bit fed up.
The man reportedly refused to move, and Farah added: "Things quickly escalated into a heated argument...Then it all kicked off. Before I knew it, we were having a full-blown fight, rolling around on the ground, trading blows."
Standards of school sport and physical education need to improve according to Mo Farah's former PE teacher.
In a new report by the Future of School and Community Sport, Alan Watkinson said there remains considerable work to do.