Police are seeking a man who robbed a North shore dairy at gunpoint, saying he is dangerous and should not be approached.

They have issued a warrant for the arrest of 28-year-old Kershaw Howard in relation to an aggravated robbery with a shotgun at a Birkdale dairy on November 12.

He is also wanted for breach of community service and is actively avoiding police.

He has links to South and East Auckland and is believed to be couch hopping between friends and family, police said.

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Police asked anyone with helpful information to call Detective Kath Young from the North Shore CIB on 09 477 5261.

Alternatively, people could contact Crimestoppers anonymously on 0800 555 111.