Racial tensions are close to boiling point in Sydney's west following the shocking gang rape of a 14 year-old girl, community leaders have warned.

The sister of the teenage victim desperately called for calm on Wednesday after friends encouraged her family to "go out there and fight".

The park where a 14-year-old girl was sexually assaulted by a group of men on Saturday.

The victim, who is of Pacific islander background, told police she was assaulted by six men of African appearance in a Doonside park on Saturday night.

Two friends of the victim had vowed on social media to stab and kill Africans in Doonside.