A man claiming to have a firearm fled from police and hid out in a building in Glenfield, Auckland this morning before being arrested.
Police said in a statement no firearm was located on the man and the man was arrested without incident.
But police searching the building later found a firearm hidden in the roof, which they believe had been placed there by the man.
The man is expected to face a number of charges, police say.
Police remain at the scene and inquiries are ongoing.
Initially police said no gun was involved in the incident.