Police have arrested two men after a home invasion break-in occurred in west Auckland where the home's occupants were threatened.

Police were called to the house in Henderson Valley after a private monitoring company caleld to say a "panic alarm" had been activated at the address.

One intruder was found still in the home and another was tracked down by a police dog after fleeing the scene, smashing through a plate glass window.

Two people inside the home were tied up and threatened with knives. They were not injured.

Two men have been arrested and are being questioned by police.

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