Gun pointed at NSW police during pursuit

A man who twice threatened police with a shotgun after fleeing a random breath test is hiding out on the NSW north coast.

Officers had been searching for the man since he pulled the gun about 7.50am on Sunday and fled from an RBT on the Pacific Highway at North Macksville before again aiming the shotgun at police at a road block on a dirt road at nearby Valla.

The man drove into bushland after encountering the road block and the abandoned van was found about 11am.

"(It) has been secured for forensic analysis," police said.

Police say they believe 37-year-old David Bell can "assist with the investigation into the incidents" but have warned people to avoid him as he may be armed and is wanted on interstate warrants.

The search for the driver of the van was suspended on Sunday afternoon.

Anyone who sees Bell, who is described as Caucasian, about 180cm tall with a solid build, brown hair and with tattooed fingers, is urged to contact Crime Stoppers.