Police are asking for the public's help after an armed robbery at the Mobil service station on Main Rd in Tokoroa.

Police said a man entered the store with a long-barrelled firearm hidden under his clothing just before 9pm on August 12.

He presented the firearm at the sole attendant and demanded cash, specifically asking for $50 notes.

He made off on foot with cash and several cartons of cigarettes, heading north on Main Rd.

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The attendant was very shaken.

The man is described as about 178cm tall, aged in his 20s, with a large build.

A Mobil Oil NZ spokesperson said it takes security at Mobil-branded retail sites extremely seriously, and is relieved no one was hurt in this incident.

"We support our service station operators to employ best-practice strategies and technology to minimise the risk of such incidents, to ensure that staff and customers remain safe.

"We continuously review and consider security measures as they become available, and regularly consult with NZ Police on how best to minimise the risk of any security incidents," it said.

Police are keen to hear from anyone who might have information about the robbery or those involved.

• Anyone who can help is asked to get in touch with police by calling 105 and quoting file number 190813/6312, or Crimestoppers anonymously on 0800 555 111.