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.
CCTV footage revealed the face of one of the offenders when his mask slipped below his nose.
They left in a white Nissan. shortly afterwards a stolen white Nissan Skyline was found parked in New Brighton Road less than a kilometre from the scene, with the engine still running.
"It is concerning that these offenders have brought a loaded weapon with them and have been prepared to discharge it, " Detective Senior Sergeant Dave Pizzini said.
"Thankfully no one was injured in this incident but we are concerned about the brazenness and determination of these offenders," he said.
Police would continue a scene examination today.