Police have cordoned off Z petrol station on Lee Rd, in the Napier suburb of Taradale, after an aggravated robbery during the early hours of the morning.
A police spokeswoman said they were called to the scene at 1.58am this morning.
"It appears a man has entered the store, threatened the attendant with a knife and stolen cash."
The offender left on foot, heading north towards Gloucester St.
No one was injured.