Armed robbers some wearing pig masks have stormed a Rolex store at the iconic Bellagio hotel in Las Vegas.
Guests tweeting from the building reported chaotic scenes at around 1AM local time (8AM GMT).
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There are not thought to be any casualties but a stampede was reported as people fled for cover.
The number of gunmen is unclear.
Police are at the scene but the perpetrators are still at large.
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