London's famous Tower Bridge, which crosses the River Thames in the heart of the British capital, was stuck open on Saturday, leaving traffic in chaos and onlookers amazed at the sight.
It was first brought to the attention of the London Metropolitan Police around 10 am, by which time the traffic was already backing up.
The historic bascule (or "see-saw") suspension bridge failed to close after opening to allow ships to pass underneath on the Thames. City of London police tweeted shortly after 5 pm that the bridge was closed to pedestrians and traffic and mechanics were working to fix the problem.