British police said on Tuesday they were dealing with a security incident at London's St Thomas' Hospital, with the nearby Westminster Bridge leading to parliament closed to traffic.
Police said they would provide more information when known.
Witnesses reported on social media that there were armed police present and that the hospital was not allowing people to enter or leave.
There was no immediate comment from the hospital.


One dead, several injured in Iranian attack on Manama building
Trump says war could be over soon, as Iran rallies behind new leader
Saudi Arabia, Jordan condemn attack on UAE consulate in Iraqi Kurdistan
Iran names Mojtaba Khamenei as new supreme leader
Indonesia says 7 killed in landfill collapse as rescue operation ends
Trump says he is 'nowhere near' deciding to send troops to Iran
Lebanon parliament extends its own mandate for two years as war intensifies
France to deploy almost dozen warships, mulls Hormuz mission, Macron says
