Around 300 people stormed into Brisbane's City Hall on Saturday night and staged an old-fashioned sit-in to protest the forced closure of indigenous communities in Western and Southern Australia.

The surprise action followed a rally in King George Square on Saturday after indigenous groups under the banner SOS Blak Australia took to the streets of Melbourne and Sydney to protest problems in indigenous communities.

Protesters occupy Brisbane's City Hall to object to the closure of remote Aboriginal communities.

A person familiar with the protest groups said the protests were organised on Facebook and Twitter and attracted 10,000 people in Melbourne and 3000 in Brisbane.

"It is indigenous groups around the country all based around the forced closure of indigenous communities in Western Australia and possibly Southern Australia," the protester said.