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.
UN's Guterres urges 'give peace a chance' in Israel-Iran conflict
UN Secretary-General Antonio Guterres warned on Friday that expansion of the Israel-Iran conflict could "ignite a fire no one can control" and called on both sides and potential parties to the conflict to give peace a chance.
Israel-Iran conflict deepens, European diplomacy steps in
As the air war between Israel and Iran enters its second week, the foreign ministers of Britain, France and Germany are making renewed efforts to draw Iran back to negotiations, while US involvement remains undecided.
Death toll rises in Gaza as aid-seeking crowds come under fire
Dozens of Palestinians have been killed by Israeli fire in the past two days while trying to access food aid in Gaza, amid a worsening hunger crisis, according to local medics.
Kremlin declines to predict when Putin and Trump may meet face-to-face
The Kremlin said on Friday it could not predict whether Russian President Vladimir Putin would meet U.S. President Donald Trump this year given how turbulent the world had become.
One killed, 14 injured in overnight Russian attack on Ukraine's Odesa
One person was killed and at least 14 were injured when Russian drones attacked the Ukrainian Black Sea city of Odesa overnight, damaging high-rise buildings and railway infrastructure, local authorities and prosecutors said on Friday.
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