The anxiety was announced at the United States Embassy in London due to the incident, visitors to the diplomatic institution are ordered not to approach the windows.
This was reported by the Daily Mail newspaper with reference to accounts in social networks of people who are in the diplomatic mission.
Some users posted photos of visitors who are sitting on the floor inside the building. The publication talked with one of the people living next to the US Embassy. He said that the territory around the building is patrolled by armed police with dogs.
The Scotland Yard confirmed that they are aware of the incident, but did not give details.
The Daily Mirror newspaper, in turn, said that the alarm was declared after a suspicious subject near the American embassy. According to the publication, the alarm was recognized as false.