Police on Wednesday carried out a controlled explosion on a suspicious package found in central London near the British parliament.
Officers were called to the gardens next to the River Thames during the afternoon and emergency services were at the scene, a police spokesman said.
An AFP photographer on the spot saw a bomb disposal robot being deployed in the area and a controlled explosion was heard.
A building where many MPs have their offices was also cordoned off along with Victoria Embankment which leads to parliament.
The area was targeted in a terror attack last year when Khalid Masood, mowed down and killed five pedestrians before fatally stabbing a police officer outside the parliament building.
A man who crashed his car into the security barriers outside parliament in August is also suspected of attempting an attack.