On the night of Wednesday, August 27, two men dressed as computer technicians and carrying tool bags entered the cargo processing and intelligence centre at Sydney International Airport.

The men, described as being of Pakistani-Indian-Arabic appearance, took a lift to the third floor of the Charles Ulm building in Link Road, next to the customs handling depot and the Qantas Jet Base.

They presented themselves to the security desk as technicians sent by Electronic Data Systems, the outsourced customs computer services provider which regularly sends people to work on computers after normal office hours.

After supplying false names and signatures, they were given access to the top-security mainframe room. They knew the room's location and no directions were needed.

Inside, they spent two hours disconnecting two computers, which they put on trolleys and wheeled out of the room, past the security desk, into the lift and out of the building.

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