The US embassy in Stockholm was evacuated on Wednesday over a possible security incident, a spokesman for the mission told AFP, while police said a suspect envelope had sparked the scare.
"We've evacuated the embassy while we are investigating a possible security incident," embassy spokesman Jeff Anderson said.
"We are working together with the Swedish authorities."
Swedish police said on their website that a patrol had been dispatched to the embassy after "a letter with unidentified content had arrived at the embassy".
News agency TT reported the letter contained an unidentified white powder.
[Image of US Embassy in Stockholm via Flickr user Johnny Soderberg.]