The family of a missing 22-year-old Aboriginal man in NSW have accused the police of withholding information.

The young man has now been missing for 12 days after he was last seen by police entering a river in north-western NSW outside of Moree.

An initial search was initiated involving crews from Fire and Rescue NSW, the NSW Rural Fire Service and State Emergency Service without success. A further search involving police divers and additional volunteers was also unsuccessful.

Police issued a statement saying officers had spotted a black hatchback speeding on the Newell highway in the early hours of Saturday morning and later found the vehicle bogged near a bridge.

Officers allege they attempted to speak with a man at the scene, however he ran from police and was seen entering the Gwydir River.

The missing man’s grandmother says they’ve received no assistance from police and the family would “fight for justice.”

“We’re still looking for him. We don’t know where he is, but we haven’t got any assistance from the police,” the grandmother told media. 

“We’ve got that feeling in our heart that he is no longer with us, and we might never find him, so we’ve just got to keep fighting for him.”