A technical fault left Tower Bridge stuck open, with cars and pedestrians stranded on either side of the London landmark.
The bascule bridge opened for use in 1894 and is a key crossing over the River Thames.
The road panels became stuck in an upright position after they were opened to allow a large boat to pass through on Monday.
A City of London Corporation spokesperson said: “Due to a technical issue, Tower Bridge is currently stuck in a raised position.
“We are working to resolve the issue as quickly as possible.”
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