PA MediaEmergency services have been called to the Palace of Westminster, where a man has scaled one of the buildings carrying a Palestinian flag.
Video shared on social media shows a barefoot man stood on a ledge several metres up Elizabeth Tower, which houses Big Ben.
The Met Police said officers were called to the tower at 07:24 GMT on Saturday.
“Officers are at the scene working to bring the incident to a safe conclusion,” the force said.
PA Media
PA Media
PA MediaBridge Street, which is at the north end of Westminster Bridge, is closed to allow the emergency services to deal with the incident, police confirmed.
A spokesman for London Fire Brigade (LFB) said they were responding to the incident alongside the police.
Crews from Lambeth, Chelsea, Soho and Islington fire stations have been deployed, LFB said.
