Miniature portraits of Napoleon and the empress Josephine were also stolen.

"Really they're priceless because they can't be replaced. We're quite distraught," York said.

The rest of the collection of nearly 500 pieces has now been relocated for safety.

Police said the robbery appeared to have lasted just 10 minutes and was a targeted theft.

"We think it's probably destined for a private collection. It could well be stolen to order," Detective Sergeant Michael Lamb told the broadcaster.

About the broadcaster:

Lance Crayon is a videographer and editor with China Daily. Since living in Beijing he has worked for China Radio International (CRI) and Global Times. Before moving to China he worked in the film industry in Los Angeles as a talent agent and producer. He has a B.A. in English from the University of Texas at Arlington.

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