Christchurch police are appealing for public information on two hooded robbers who went into an Asian supermarket last night and demanded the synthetic cannabis K2.

Detective Sergeant Richard Quested said the offenders walked in the back door of the Kosco shop in Main North Rd, Papanui, about 8.15pm.

The men threatened the lone shop assistant, saying they had a knife. No weapon was presented.

One man went behind the counter and grabbed a plastic bag that had K2 in it.

Both men then ran down Langdons Rd towards the railway line and disappeared, Quested said.

He said police had viewed "very good" security footage, which was likely to be made public.

One offender was European, of medium build, wearing blue jeans and a dark grey hoodie.

The other was Maori or Pacific Islander, about 20, 1.85 metres tall, and wearing a light grey hoodie with the word ''Globe'' on it.

Anyone with information should call Quested on 373 9102.

K2 is a legal over-18 synthetic cannabis that has caused problems for police in Dunedin.

They say they have encountered offenders using it and becoming aggressive and having hallucinations.

Police this month visited K2 retailers in Dunedin and appealed for them to take K2 off the market.

Christchurch police say it has not yet been an issue in the city.

Quested said the shopkeeper was "pretty shaken up" but was unharmed.

- © Fairfax NZ News

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