Woman holds up RAAF Richmond military base

Police are hunting for a gun-wielding, balaclava-wearing woman who held up one of the country's largest military bases on Friday afternoon.

The Royal Australian Air Force base at Richmond, on the north-western outskirts of Sydney, was placed in lockdown on Friday evening after the woman robbed a bank within the heavily fortified base.

Richmond is the hub of logistics support for the Australian Defence Force and houses several of the force's biggest units, including C-130 Hercules aircraft and an intelligence squadron.

It has its own post office, military credit union and public transport network.

The woman, dressed in all black and wearing a balaclava, entered the financial institution with a gun just after 3.30pm and threatened another woman working there.

She then fled the scene with an undisclosed sum of cash.

Police have appealed for help to find the woman, described as Caucasian, about 20 years old and last seen wearing a black jumper, black cargo pants, black boots, a black balaclava and a black backpack.

The Defence Force declined to answer questions about how an armed woman could enter the heavily secured base.

"NSW Police are in attendance and Defence has no further information to release at this time," a spokesman said.

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