More than 12,500 runners participated in the London Landmarks Half Marathon on Sunday in the UK. /CFP

Some participants dressed up in costumes to raise money for charities. /CFP

The charity event was supposed to take place on March 29, 2020, but was postponed due to the coronavirus. It was one of London's first mass-participation events after restrictions were lifted. /CFP

The route passed by iconic landmarks such as Big Ben and the Tower of London. In the past seven days, London recorded 26,251 confirmed COVID-19 cases, according to the UK government. /CFP