Police are appealing for public assistance following an armed robbery in Lalor last month.
It is believed the victim, a taxi driver, picked up an unknown man on Flinders Street, Melbourne on Friday 20 May about 12.30am and was asked to drive to the intersection of Edgars and Franklin road, Lalor.
When they arrived at the destination the man pulled out a firearm and demanded money from the victim.
He then pulled money from the victim’s top pocket before searching through a bag on the floor of the taxi.
The man then fled on foot, travelling west along Franklin Road.
No one was physically injured during the incident.
Detectives from the Whittlesea Crime Investigation Unit have released images of a man they believe may be able to assist them with their enquiries.

The man has a distinctive tattoo on his left hand.
A third male has now been charged with a string of offences after allegedly holding up a number of taxi drivers not only yesterday morning but other drivers during the past month.
A 13-year-old boy from Brunswick was arrested this morning and has been charged with theft and assault with a weapon, theft and attempted robbery.
Two men, a 24-year-old from Broadmeadows and a 16-year-old from Coburg, were both remanded in custody last night charged with two counts each of armed robbery, three counts robbery, two counts attempted robbery and four counts of theft.
The trio were also charged with intentionally and recklessly cause injury, assault with a weapon and seven counts of committing an indictable offence whilst on bail.
The charges relate to 10 separate incidents in the Brunswick area where taxi drivers were allegedly targeted between 5 – 15 June.
It is expected the 24-year-old will appear at Melbourne Magistrates Court and the both teenagers at a Children’s Court today.
Police are seeking the assistance of the public for information following the armed robbery of a taxi driver at Nowra this morning.
About 2am (Saturday 9 April 2016), a taxi drove to Coconut Drive to collect a booking. A woman entered the rear of the taxi and the male approached the front passenger door.
The man has leant inside and produced a handgun, threatening the driver and demanding money.
The 62-year-old driver handed over cash and the pair fled the taxi running towards Illaroo Road.
The man was not injured.
Police are now searching for a man described as being Aboriginal/Torres Strait Islander appearance, about 30-years-old old, 180-185cm tall with a slim build. The woman is described as being short with a medium build, about 30-years-old with dark hair.
Investigations are continuing.
Police are investigating the circumstances surrounding the robbery of a taxi driver in Wagga Wagga last night.
About 11.30pm (Monday 22 February 2016), a 39-year-old man was driving his taxi to Turvey Park to collect a passenger.
When at the corner of Lindsay and Trevor Street, he collected the male passenger who got into the front passenger seat.
Once inside the vehicle, the man produced a knife and threatened the driver, demanding cash.
The driver handed over a sum of cash and the passenger fled from the car.
Police are now searching for a man described as 183cm, or 6ft tall, and at the time of the robbery he was wearing a black balaclava and gloves that had a white skeleton pattern, with black clothing.
Anyone who may have information about this robbery should contact police at Wagga Wagga.
A youth has been charged following investigations into two armed robberies in the New England Local Area Command during the past two weeks.
About 11.50pm on Sunday 14 February 2016, a 51-year-old man was driving his Taxi when he was allegedly called to Alexander Street to pick-up a 16-year-old youth.
The youth was driven to Kirkwood Street where it’s alleged he threatened the driver with a sharp object and demanded cash.
The driver stopped the taxi, allegedly threw his wallet out the window, before the youth grabbed the wallet and ran off.
The driver contacted police and an investigation was commenced.
About 3.30pm yesterday (Monday 15 February 2016) detectives from Armidale arrested a 16-year-old male at an Armidale address.
He was taken to Armidale Police Station where he was interviewed.
The youth was charged with two counts of robbery while armed.
The second robbery allegedly involved a delivery driver and occurred in Tysoe Crescent, Armidale, on Tuesday 2 February 2016.
He was refused bail and will appear in a Children’s Court today (Tuesday 16 February 2016).
Police are appealing for information after the armed robbery of a taxi driver in Armidale at the weekend.
About 11.50pm (Sunday 14 February 2016), a man requested a taxi to attend a West Armidale address.
Upon arrival, the man entered the taxi and provided an address to the driver.
A short time later, the passenger threatened the driver with a sharp object and demanded money.
The vehicle stopped at the intersection of Kirkwood and Canambe Streets, where the man fled with cash. He was last seen running on Cookes Road, Armidale.
The driver contacted Triple Zero (000), and officers from New England Local Area Command attended and launched an investigation.
The driver, a 51-year-old man, sustained minor lacerations to his hands during the incident; however, he did not require medical attention.
Police conducted a thorough search of the surrounding area but the passenger was not located.
The taxi was seized from the location and will undergo forensic examination.
Inquiries into the matter are continuing and police would now like to speak to a man who may be able to assist with the investigation.
The man is described as being of Caucasian appearance, approximately 170-180cm tall, with a short beard and of a medium build. He was last seen wearing a dark-coloured hooded-jumper.
Police are currently investigating the report of an armed robbery of a taxi driver that occurred shortly before 7am on Thursday the 4th of February 2016 in Kerry Court, Summerhill.
The driver was threatened with a knife and money demanded from him. He was not injured as a result of the incident, but the offenders allegedly took $150 in cash.
The offenders, described as two men aged in their late teens – early twenties and wearing black and grey hooded jumpers respectively, were last seen fleeing on foot towards Hardwicke Street, Summerhill.
A teenager has been arrested and police are searching for a second suspect after a robbery at Salisbury Park this morning.
Police will allege that at about 5.10am, patrols were called to Main North Road after a taxi driver reported that he had been threatened with a knife by one of two boys he was taking to Andrews Farm, before they stole cash and a mobile phone and ran off.
The victim was not injured.
Police searched the area and later located one of the boys in Elizabeth Vale.
A 17-year-old Andrews Farm boy has been charged with aggravated robbery and carry offensive weapon, and was refused bail. He will appear in the Elizabeth Youth Court on Tuesday.
Police are appealing for witnesses after an attempted armed robbery of a taxi driver in West Kempsey this morning.
About 6.10am (Sunday 29 November 2015), a 67-year-old taxi driver attended Roscoe Turner Avenue, to pick up a passenger.
As the taxi stopped outside the front of a home, the driver heard the back window of the taxi smash.
A man then approached the driver’s door and threatened the taxi driver with a shortened firearm, demanding cash.
The driver reversed away from the man, who smashed the windscreen with the butt of the firearm.
The taxi drove to Kempsey Police Station.
Officers from Mid North Coast Local Area Command commenced an investigation.
As inquiries continue, investigators are appealing for anyone who may have witnessed the incident or has information that may assist are urged to contact Kempsey Police Station.
Police would like to speak to a man described as being between 165 and 175cm tall, thin build, wearing dark tracksuit pants and a black t-shirt.
Police are investigating an incident this morning at Walkley Heights where a taxi driver was robbed by two men.
Just before 6am a taxi driver was finishing his shift and cleaning his cab in Pioneer Ave Walkley Heights, when he was approached two men, one armed with a golf club.
The men threatened the taxi driver and then smashed several windows of the cab before stealing the man’s wallet, mobile phone and the night’s takings.
The two suspects fled in a brown Ford Territory driven by a third man.
There were no injuries.