The Armed Offenders Squad has swarmed around Southdown Lane in Penrose, Auckland.

Police were executing a planned searched warrant involving a wanted man this afternoon.

The operation had been completed and five people were currently in custody, Counties Manukau West area commander Inspector Naila Hassan said.

At 1.39pm a witness said a woman had been arrested by police after four other people were arrested earlier.

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The police helicopter was seen hovering over the scene off Great South Rd, a witness said.

The Armed Offenders Squad has been aiming guns what looks like an industrial building on the road, a witness said.

The road was closed for several hours during the operation but had reopened at 2.25pm.

Fire and Emergency New Zealand (FENZ) were seen setting up a shower on the road, another witness said.

A FENZ command unit arrived on site around 1.30pm.

Another witness said earlier it appeared a man had been bitten by a police dog and was sitting bleeding under a tree.

Four people wearing handcuffs have been taken out of a building by police, he said.

"I was coming back to work when I noticed the road was closed and there were cops with guns," a witness said.