Police have arrested four people in relation to a Niddrie bank heist that netted hundreds of thousands of dollars.
The Westpac bank was robbed by two men dressed as security guards on April 12 this year, but images of the men were only released this week.
The pair had dressed in uniforms and carried what police believed were pistols when they robbed the Keilor Road bank.
A police spokeswoman said four people had been arrested on Thursday morning. Fairfax Media has been told one man was arrested by heavily-armed Special Operations Group officers near the corner of Flinders Lane and King Street about 8.40am.
Earlier this week, police said one of the men had waited outside during the robbery and the other, described as looking like a bodybuilder, was led inside by the manager to collect bags of cash.
Both men left the bank on foot and no car was seen during the robbery. The men wore shirts with what appeared to be Armaguard logos, green pants and baseball caps with Linfox logos.
The guards who were meant to be picking up the cash arrived later that day.
No one was injured during the incident.
A 46-year-old man from Keysborough was arrested about 7.10am in Braeside.
A 24-year-old Bentleigh East man was arrested about 8.40am at the intersection of Kings Street and Flinders Lane, Melbourne.
A 26-year-old man, also from Bentleigh East, was arrested at his home address about 9.35am.
About 10am, police arrested a 49-year-old woman at a residential property in Ormond.
Detectives are in the process of executing a number of warrants in Keysborough, Bentleigh East and Ormond.