Video has been posted online overnight showing activists torching the Commonwealth Games surfboard countdown clock at South Bank.

The group said the attack was in response to, what they described as, Gold Coast police's "excessive force" at the Indigenous land rights protest on Friday, which saw in five activists arrested and charged.

Activists torch Commonwealth Games countdown clock at South Bank.

In a statement posted with the video, the arsonists said the Commonwealth's "time is up" and called for more activists to travel to the Gold Coast and take part in further protests.

"We watched on social media as the police brutalised and arrested peaceful Stolenwealth Games protestors on the Gold Coast," the activists' statement read.