The National Party office in Auckland's Epsom has been broken into and laptops containing election material were taken.

The National Party is hinting at sinister political motivations behind a burglary at one of its offices.

Over the weekend, offender or offenders unknown jimmied open a window at the party's northern regional office on Great South Rd in Auckland's Epsom and stole three laptops containing sensitive election material.

"On the surface of it, it looks like a disturbing and sinister start to election year," National's Epsom list MP Paul Goldsmith said on Monday morning.

CHRIS McKEEN/STUFF Paul Goldsmith, a National list MP, has his electoral office in another part of the building.

The laptops belonged to three staffers, he said.

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Nothing else was touched during the break-in, spurring fears of a clinical, targeted operation.

Chris McKeen/Stuff Paul Goldsmith said the burglary looked "sinister".

There were no signs of disarray inside the office, aside from empty space on the staffers' desks.

Like all staffers at the office they were involved with the party's election campaign, Goldsmith said.

The party had called the police but as of 11am, officers had yet to visit the office.

"Like many New Zealanders who are victims of crime, it takes a while for the wheels to turn," Goldsmith said.

Goldsmith and fellow list MP Dr Jian Yang, who has been the subject of controversy because of his role in training Chinese spies, have their electoral office in another part of the building.

Deputy leader Paula Bennett said the break-in had triggered an alarm and the thieves had "grabbed the laptops and ran".

The laptops were encrypted so the party was confident any private information was secure, she said.

Bennett said it was disturbing to think the party had been targeted at the beginning of an election year.

She said the situation appeared suspicious and the party would let the police do their job and investigate.

A police spokeswoman said police received a report of a burglary at an address on Great South Rd, Epsom, about 9.45am on Monday.

"Police will attend the scene today," she said.

Police figures show there are 180 burglaries reported per day nationwide.

In more than half of burglaries, the offender entered through a door – and in most of those cases, the door was unlocked.

Fifty-seven per cent of burgled properties had no active electronic security features.