Detectives have charged a second man as investigations continue into the alleged armed robbery of cash-in-transit guards in Sydney’s south-west earlier this year.

Just after 11am on Thursday 5 April 2018, two armed guards were intercepted by a silver Volkswagen Golf as they exited their armoured truck for a delivery on Mackinder Street, Clemton Park.

Two men, both allegedly armed with rifles, got out of the Golf and threatened the guards, demanding cash.

One of the men allegedly approached the guards, and unsuccessfully attempted to remove one of their firearms, before stealing the cash bags and returning to the Golf, which was then driven from the location at speed.

The guards were not physically injured during the incident.

Officers from Campsie Police Area Command attended a short time later and established a crime scene, which was examined by specialist forensic officers.

Detectives from the State Crime Command’s Robbery and Serious Crime Squad established Strike Force Callagher to investigate the incident.

A 35-year-old man – the alleged getaway driver – was charged by investigators last month. He remains before the courts.

Following further investigations, strike force detectives, assisted by the Public Order and Riot Squad, executed five search warrants at Cambridge Park, Berkshire Park, Castlereagh, and Emu Plains, from 6am today (Wednesday 5 December 2018).

During the warrants, police seized several items relevant to the investigation, including cash, firearms, a boat and a Holden Senator sedan.

A 30-year-old man was arrested at the Cambridge Park home and taken to Penrith Police Station.

He was charged with robbery while armed with a dangerous weapon, two counts of possession of more than three firearms, five counts of possess prohibited weapon, possession of tablet press, six counts of supply prohibited drugs, and two counts of deal with property suspected of being proceeds of crime.

The man has been refused bail to appear at Penrith Local Court today.

Investigations under Strike Force Callagher are continuing.