Mobile phone footage has captured a brawl that broke out near a soccer tournament organised by the South Sudanese Football Association in Sydney's outer west.

The disturbing pictures show the fight spilling out onto the streets, in one of the two violent incidents this weekend that involved members of Australia's fastest-growing migrant community.

The second event took place in the outer Brisbane suburb of Woodridge, where a seventeen-year-old boy was killed after a birthday party advertised on Facebook turned into a gang rumble.

• Time to dob in racists
• Changing face in Australia's suburbs
• Australia's new immigrations patterns

Poles were ripped from the ground to be used as weapons and letter boxes were thrown.

The violence has shocked Australia's African community, including Isaac Kisimba - a typical African civil war refugee.

He fled the Congo when war threatened to tear his country apart, wanting a better life for himself and his family.

More stories from reporter David Richardson

However, Kisimba says there were barriers to overcome when he immigrated to Australia.

"Language was a barrier, and being from the African background there were also some other barriers to access the type of jobs you'd prefer to have," Kisimba said.

Australia is home to about 20,000 South Sudanese, almost all of whom were granted humanitarian status. Sadly, despite the horrors that the survivors have lived through, many have not settled well here, and since South Sudan gained independence last year, some want to return.

A new report by think tank Australian Policy Online called The Last Mile records the discontent of Australia's South Sudanese. 78 South Sudanese were interviewed face to face for the report, and another 300 took an online survey.

79 per cent have become Australian citizens and most are grateful but feel disconnected - blaming racism and a perceived bias by Australian law enforcement agencies.

• Australian Policy Online - www.apo.org.au

This reporter is on Twitter at @RichoTT7