A South Sudanese leader has spoken out against the 'serious gang culture' in Melbourne after a migrant teenager was stabbed to death.

Aguer Akech Lual, 17, died early on Sunday after a brawl broke out between rival youth groups near the Keilor Plains railway station at St Albans in Melbourne's north-west.

He was treated by paramedics but died at the scene.

Journalist Ajak Deng Chiengkou, who had known Mr Lual since birth, said he hoped the community would take Melbourne youth gang violence seriously in the aftermath of the teenager's death and that of 19-year-old Laa Chol last year.

© Provided by Daily Mail Aguer Akech Lual had his young life cut short on Sunday leaving his family and Melbourne's Sudanese community devastated

He added that Mr Lual's mother had attempted to relocate him to another country to escape the violence.

'For months, the mother has been trying to move him to Africa to stay away from the youths who have always threatened his life but nothing worked because of the system,' Chiengkou wrote on Facebook Sunday.

'We were once warned that this kid was in danger from some South Sudanese youths who once wanted to harm him. This is heartbreaking and the behaviours of the youths are getting out of hand.

'With the death of Aguer, Laa Chol and many other young lives that have allegedly been lost in the hands of fellow South Sudanese, I hope the community will agree that there is a serious gang culture now in the community.

© Provided by Daily Mail Ajak Deng Chiengkou (pictured) said that he hopes 'the community will agree that there is a serious gang culture now' after the deaths of Aguer Akech Lual, 17, and Laa Chol, 19

'Still shocked but I am getting tired of seeing such young lives being lost because of violence and the rest are being lost by suicide.'

Mr Chiengkou, the former executive of SBS's Dinko radio station, said a senior police commander told him in September that South Sudanese communities should be vigilant because 'most of the young people are infiltrated by organised crimes'.

But Victorian police and the state's Premier Andrew Daniels have repeatedly refused to say there's an African gang' problem in Melbourne, News.com.au reports.

Victorian police said Mr Lual was chased and allegedly attacked by a group wielding 'sticks, fence posts and knives'.

© Provided by Daily Mail 'He was a very good boy … he was not part of a gang,' his mother Martha Mayola told Nine

The teenager had been living in Adelaide and was in Melbourne to surprise his mother for Christmas before heading to Uganda later this week to attend boarding school.

His family rallied together on Monday to support his shattered mother Martha Mayola, who was rushed to hospital after collapsing when she was told the devastating news on Sunday.

She and Aguer migrated to Australia five years ago.

'He was a very good boy… he was not part of a gang,' Ms Mayola told Nine News.

'I was shocked... I didn't know he would die like this.'

Family and friends admitted Aguer previously had brushes with law, but had not been in trouble since joining local sport and church groups.

© Provided by Daily Mail Detectives spent Sunday investigating the scene and speaking to nearby residents

They claimed Aguer was the victim of an ambush and had become a target of other South Sudanese youths.

Sudanese Community Association in Victoria chairwoman Achol Marial told The Australian there were police concerns about his safety prior to his death.

'He had to be kept kind of hidden. He was co-operating with police, he may have been giving information that got him into trouble.'

Police refused to comment on whether Aguer was known to police.

Ten males were arrested at the scene and questioned by police but were all later released without charge.

© Provided by Daily Mail Aguer Akech Lual, 17, died at the scene of the fight at St Albans, northwest of Melbourne in the early hours of Sunday morning.

No charges had been laid as of Monday night.

Victoria Police has launched a public appeal into the deadly fight involving up to 30 African males.

It's understood the two groups had arranged to meet late on Saturday night in relation to a dispute regarding a vehicle.

After meeting at the train station, the groups went to a nearby home in Fox Street where a verbal altercation later took place.

Members from one group - including the victim - were chased back to the train station where a violent altercation involving sticks, fence posts and knives broke out.

© Provided by Daily Mail Aguer Akech Lual's body was found on Regan Street in St Albans early Sunday morning

Aguer was injured in the brawl and was unable to be revived after collapsing in nearby Regan Street.

© Provided by Daily Mail The South Sudanese community are in mourning following the death of the young teen (left) Males in the second group left in three vehicles from the scene including the silver Holden, which is yet to be found. The two other vehicles have not been identified.

A friend who was with him on the night he died claimed the car stolen at a soccer match earlier in the day belonged to Aguer.

Det Insp Day urged anyone with information or may have CCTV footage, dashcam and nearby residents who may have found 'foreign objects' on their properties to come forward.

A 17-year-old boy, who can not be named for legal reasons, stabbed Ms Chol when he gatecrashed a party at the EQ towers in July 2018.

In September, Victoria police set up operations to target youth criminal behaviour after a series of fights between rival gangs live streamed online revealed the extent of violence occurring in Melbourne streets.