Police have warned members of the public not to join the search for alleged cop killer Desmond Freeman, who has been missing for almost a fortnight.

A $1 million reward has been offered for information that leads to his arrest.

The reward is the largest ever offered in the state.

Police have urged locals to leave the search to the experts, as Freeman is believed to be heavily armed.

Despite hundreds of tip-offs, there have been no confirmed sightings.

More than 450 officers will continue to search over 100 properties and acres of bushland this week.

Officers have previously stated that they believe some people might know his whereabouts or are potentially harbouring the alleged killer.

Meanwhile New South Wales Police is on alert for potential copycat attacks, with intelligence suggesting more than 370 sovereign citizens could be living in the state.

Many of those identified are said to be “harmless” and “nonviolent” but the recent killings of the two Victoria officers has many members of the force concerned.

Old gold mines complicate search

The manhunt is being complicated by the mining history of the area, with a former friend of Freeman’s telling The Age that nobody knew how many abandoned mine shafts were in the area.

Ray Kompe said he though it was possible Freeman would be hiding down a mineshaft.

Police confirmed yesterday police were continuing to ’clear the mineshafts and caves with our experts’.