The armed bandits opened fire at officers near Mangoplah and Henty about 30 kilometres south of Wagga Wagga, in the NSW Riverina region on Friday.

Heavily armed police including specialist tactical officers from Sydney searched on Saturday for the men, but so far they remain at large. 

Father and son Gino and Mark Stocco, who have been on the run for eight years from police in NSW, Queensland and Victoria, allegedly fired shots at officers using a "high-powered" rifle from a silver Nissan Navara about 2pm near Henty Road in Mangoplah. 

A high-speed police chase ensued, was aborted due to safety and then restarted a short time later on Cheviot Hills Road, where the armed bandits again shot at police. 

It triggered a major police operation, with officers advising nearby residents to leave their properties as the armed men were believed to be on foot. 

Officers located the abandoned vehicle in dense bushland on Saturday afternoon, some 22 kilometres from Strike Force Kalkadoon's command post at the Pulletop and Cheviots Hill roads intersection. 

Wagga Superintendent Bob Noble confirmed a number of items had been seized during the search, but could not elaborate on the role they played in the incident.

Police said the operation was downsized as police were confident the duo have fled the area and the command post was relocated back to Wagga police station. 

Specialist officers from Sydney were dismissed, but Superintendent Bob Noble reminded residents to remain vigilant.

"I don't believe residents in the area have any need to be overly concerned about their safety, but I would urge them to be very vigilant about anything that's out of the ordinary, about their personal and premise security," Superintendent Noble said.

Anyone with information should call triple-0 or crime stoppers on 1800 333 000.

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