This story has been updated with a new date for the race.

The Color Run was generating a lot of buzz in Shenzhen, but now people will need to wait till the end of the month if they still want to participate.

Today it was announced on The Color Run website that the Color Run, which was set to take place on March 8, has been postponed to March 29. From the official announcement:

As advised by the Government authorities and the Police, we are sorry to inform you that The Color Run Shenzhen on March 8th has to be postponed to March 29th. Pre-Event Packet Pick-Up will be held on March 27th to March 28th accordingly. Registered Color Runners can choose to keep your spot and join us on March 29th. If you are unable to join us on the new date, you can request a refund of your registration fee*, starting from 9 AM, March 6th to 5 PM, March 13th and any request for refund will not be accepted after that.

Starting from March 14th at 9 AM, we will reopen the registration to release the available spots. Registration deadline is 12 PM, March 26th, or till sold out. Thank you for your cooperation and understanding!

Many are already speculating that the postponement is related to the Kunming attack over the weekend, which has spooked Chinese security officials and already resulted in a beefier deployment of police in other cities in China.

The Color Run bills itself as the “Happiest 5K in the World”. The untimed race sees runners splashed with paint after every one kilometre completed.