A shot was fired during an armed robbery of a service station on the Mt Wellington highway early today.
Two people, one armed with a shot gun, arrived at the Mobil petrol station about 1.25am and demanded to be let inside.
The two people working at the petrol station retreated to a locked back office, police said.
The offenders got in after smashing a glass panel in a doors then fired a shot in an attempt to get access to the counter area.
They took the till drawer and tobacco products, police said.