Video report by ITV News correspondent Damon Green
A minute's silence has been held at the Great Manchester Run in memory of the 22 people killed by last year's terror attack in the city.
The 10K and half-marathon races take place almost exactly a year after Salman Abedi carried out his suicide attack at an Ariana Grande concert at Manchester Arena.
As well as killing 22, hundreds were injured in the bombing.
An estimated 30,000 runners and wheelchair athletes took part in the two races, making it the third largest running event in the country.
Olympian Sir Mo Farah won the men's 10K after outsprinting Moses Kipsiro, beating the Kenyan by one second to win in a time of 28 seconds and 27 seconds.
In the women's race, Ethiopian champion Tirunesh Dibaba won comfotably in 31 minutes and eight seconds, 49 seconds ahead of second-place finisher Joyciline Jepkosgei.
The half-marathon set off at 9am, while the wheelchair start at 12.30pm marked the beginning of the 10K races.
The 2017 Great Manchester Run took place just days after the deadly attack.