Police in Australia have arrested four men over the theft of a haul of projectors worth more than A$2.5 million (£1.5 million).

A gang raided a warehouse in Brisbane in June and made off with more than 500 InFocus projectors and associated audio-visual equipment. A specialist investigation was launched in September - called Strike Force Kogo - after inquiries revealed that the projectors had begun to show up in Sydney.

On Wednesday last week, a 34-year-old man was arrested at his fortified home in an up-market part of Sydney. In an associated raid two hours later a 44-year-old man was also arrested and another 33-year-old turned himself in to police.

Shortly following these arrests, a 39-year-old man - alleged to be the principal of the group - was arrested in the Burwood area of the city.

Surry Hills RES Commander, Detective Inspector Gavin Wood, said the gang were well aware of how valuable and how in demand projectors have become and had already made significant money on the haul.

"These are very expensive projectors valued at around $5000 each and we believe a number may already have been sold off," he said.

He added that more than 160 stolen projectors had been recovered from a number of locations across Sydney - including two storage facilities - and said, "We are still making inquiries into the location of those stolen goods still outstanding."