A man has been arrested after reports that a person was seen carrying several knives outside the Houses of Parliament.
Officers were called to the scene in central London at 14:00 GMT on Tuesday where they apprehended the suspect, the Met Police said.
The 34-year-old was arrested on suspicion of possession of an offensive weapon in a public place and has been taken to a police station.
No injuries have been reported, the force added.
Police cars were seen parked in front of Carriage Gates - one of the most prominent entrances to the Palace of Westminster - following the incident on Tuesday afternoon.
A man wearing a red hooded top was seen handcuffed and surrounded by police.
The area was cordoned off during the incident and the entrance was closed.
A spokesperson for UK Parliament: "We are aware of an incident outside Carriage Gates. Parliamentary Security and the Metropolitan Police are present and managing the situation."