A 15-year-old boy who had just started work as an apprentice in an automotive workshop died after being stabbed in the chest in Sydney's west today.

The boy, who a friend said was due to turn 16 this month, was attacked at an industrial estate in Marieanne Place, Minchinbury, police say.

The boy's father is reportedly a member of Lone Wolf bikie gang, but police insist the stabbing was not bikie related.

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Mount Druitt area commander Superintendent Wayne Cox said there was "no intelligence" to suggest the stabbing was bikie related.