Chelsea Bridge was temporarily closed off on Monday (August 21) while the authorities worked to remove a suspected WW2 bomb device.
The move was announced on Twitter by Westminster Police, who also said Embankment had been closed off because of suspected "explosive ordinance."
The closure of the bridge caused significant traffic as the police and experts inspected the device.
The bridge is just round the corner from the Houses of Parliament, which were the scene of a major protest today as the iconic Big Ben clock was silenced.
On Twitter, around 1:30pm, the police force announced the bridge had re-opened.
A number of devices from the Second World War, suspected to have been dropped by the Luftwaffe during bombing raids in the Battle of Britain, have recently been uncovered around the country.
One unexploded bomb - reportedly the largest one discovered yet - was discovered in Aston in May, and was subsequently detonated in a controlled explosion.