It is a real blow for any athlete to miss out on a major championships through injury, but to have fought so hard to regain full fitness and to have to take such a difficult decision at this stage is particularly hard.
We wish Mo all the very best and hope to see him back to his peak very soon
More top news
More than a tenth of the Piccadilly Line train fleet is out of action because of emergency repairs to damaged wheels.
Rows of students stood and turned their backs before filing out of the lecture theatre.
Effie the endangered Western lowland gorilla has given birth to a healthy baby boy at London Zoo.