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.
72 killed in Israeli attacks on Lebanon as it warns residents to leave south
Israel has warned residents to immediately leave a swathe of south Lebanon on Wednesday, ordering them to move north of the Litani River on the third day of full-blown hostilities with Hezbollah, with the death toll rising to 72 people.
Landslide kills over 200 people at Congo's Rubaya mine
More than 200 people have died on Tuesday in a landslide triggered by heavy rains at the Rubaya coltan mine in eastern Democratic Republic of Congo, the country's mines ministry said on Wednesday.
80 people killed after US sinks Iranian warship
The US–Iran war widened sharply on Wednesday after a US submarine sank an Iranian warship off Sri Lanka, killing at least 80 people, and NATO air defences destroyed an Iranian ballistic missile fired towards Turkey.
Emergency GCC-EU meeting to discuss Iranian aggression
An emergency GCC-EU ministerial meeting is set for Thursday, March 5, bringing together foreign ministers from GCC states and the European Union.
Omani navy rescues cargo ship crew after missile strike
The Royal Navy of Oman has rescued all 24 crew members of a cargo ship after the Malta-flagged vessel was reportedly struck by two missiles near the Strait of Hormuz.
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