A man scaled Tower Bridge forcing police to shut the landmark Thames crossing to traffic.
The incident sparked congestion to Limehouse back along the Highway and in the one-way system back to Aldgate. Buses were placed on diversion.
Police said the man scaled the world-famous landmark shortly before 11am, but he was brought down safely at around 12.20pm.
Tower Bridge posted on X at 12.45pm that the crossing had reopened.
Meanwhile, the Blackwall Tunnel was also forced to shut southbound following a lorry crash at around 8.50am, but has since reopened.
The incident comes a day after a man was arrested after spending more than 16 hours barefoot and holding a Palestine flag while perched on the clock tower of Big Ben.
The man scaled the Elizabeth Tower on Saturday morning and finally came down just after midnight on Sunday, with images from the scene showing the man being lifted to the ground in a cherry picker.
In a statement issued just after 1am, the force said: “The man has now been arrested. This has been a protracted incident due to the specifics of where the man was located and the need to ensure the safety of our officers, the individual and the wider public.
“We worked with other agencies including the London Fire Brigade and deployed specialist officers to bring this incident to a close as quickly as possible whilst minimising risk to life.
“We have been in close liaison with the Parliamentary Estate throughout and all roads have been reopened.”
Emergency crews had been at the scene with dozens of uniformed police officers guarding the cordon which extended from Bridge Street to Westminster Bridge.
