Armed police descended on St Thomas’ Hospital in London after a ‘security alert’.
Police have since stood down and are now removing cordons around the hospital.
Officers were called over a ‘report of threats’ made by a male at the hospital, although police did not find weapons or make any arrests at the scene.
They located and spoke to a male inside the hospital but no further action was taken.
Eyewitnesses said patients and staff were ‘locked down’ at the site, which is opposite the Houses of Parliament, during the incident.
Westminster Bridge and Lambeth Palace Road were also closed, according to BBC Radio London Travel.
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Lambeth Police tweeted: “Police were called at 09:18hrs to St Thomas’ Hospital SE1 following a report of threats made by a male. No weapons were seen. Armed officers attended. Local road closures were put in place. The hospital was not evacuated.
“Officers subsequently located and spoke to a male inside the hospital. The incident was stood down at approximately 10:30hrs. There have been no arrests. This was not treated as a terrorism incident.”
An NBC producer said all staff, wards, departments and operating theatres inside the hospital were locked down.
Joe Sheffer wrote: “Incident at St Thomas’ hospital appears to be in south wing according to staff inside hospital.
“All staff, wards, departments and operating theatres have been locked down inside St Thomas’ hospital. Rumors abound on internal whatsapp groups, but nobody seems clear what is going on.”
One witness added: “My girlfriend just came out of an appointment there and said she saw 10 armed police rushing into it as she was leaving.”
A woman told The Sun: “There were police everywhere. I heard it was a bomb threat and the hospital went into lockdown.
“It seemed to be over with very quickly, but for a while it seemed like a life or death situation.”
One person said they had never seen so many officers.
Others described how the Met had blocked access to St Thomas’ Hospital and adjacent roads with officers imposing ‘what looked like a lockdown’.
Financial Times journalist Robert Wright said: “I’m at St Thomas’ Hospital, where there’s some kind of serious incident under way. I can see armed police and there’s a helicopter overhead.”
At 10.07am, Lambeth Police tweeted: “Police are dealing with a security alert at St Thomas’ Hospital, SE1. We will provide further info when known.”
However, around 30 minutes later Lambeth Police added: “The security alert at St Thomas’ Hospital is being stood down. We are in the process of removing cordons.”
BBC Radio London Travel tweeted: “Westminster Bridge is currently closed by the police – looks like there’s a cordon near St Thomas’ hospital too.
“Westminster Bridge and Lambeth Palace Road are closed. Also restrictions for pedestrians. @LambethMPS say they are dealing with a security alert at St Thomas’ Hospital.”
A London Ambulance Service spokesperson said: “We were called at 9:37am this morning (13 October) to reports of an incident at St Thomas’ Hospital.
“We dispatched a number of specialist resources to the scene and worked closely with our emergency service colleagues there.
“We did not treat any patients and we have been stood down from the incident.”