A gunman has been reported inside a Brisbane business, with police blocking surrounding traffic as they investigate the incident.

It's believed the man entered the Compton Road business in Stretton, armed with a firearm, this afternoon.

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Police have shut down traffic on Compton Road in both directions and it's understood several highly trained specialist police officers are on the scene.

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Detours are in place to Condamine and Gowan Roads, with significant delays expected for some time.

More to come.