Grandstand collapses at Brisbane Broncos fan day

Three men have been injured after a section of a small grandstand collapsed at a Brisbane Broncos fan day.

The grandstand wilted after several hundred people piled on to the temporary structure for a photo behind the senior team who were waiting in the change room.

As the crowd waited, a section of the grandstand at the rear gave way and several people fell as far as 2.5 metres.

The incident occurred just before 10am (local time).

"It just gave away suddenly," an onlooker told AAP.

A Department of Community Safety (DCS) spokeswoman told AAP one man refused to be taken to hospital while another was still receiving treatment.

A third person sustained minor injuries.

"They are still treating one person at the scene," the DCS spokeswoman said.

Despite the drama the fan day continued.

The Broncos had just returned from Sydney where they opened the NRL season with a win over Parramatta.

-AAP