STOCKHOLM - The staff of the US embassy in the Swedish capital have evacuated the building after a suspect letter was found and police are investigating, police and the embassy said on Wednesday.

A spokeswoman for the fire service said she had been told by police that a white powder had leaked out in the building, but neither she nor the police had further details.

Spokesman Jeff Anderson said essential staff had left the building while police investigated.

"We are looking into a possible security incident," he added.

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