A group of seven offenders have smashed in the windows of an Auckland petrol station with hammers before making off with cash and cigarettes.

Police are still at the Z petrol station in Westgate, and it is closed to the public.

A police spokeswoman said the store was robbed by a group of seven offenders at 3.19am today.

One staff member was there at the time but is not hurt.

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"The offenders were in two vehicles and came and took cigarettes and cash. Members of the public saw it and called the police."

A police spokeswoman said the offenders were all males but their age was not yet known.

"Police are following strong lines of inquiries," she said.

Police are carrying out a scene examination and are following up several leads.