The Met Police have asked members of the public to avoid a number of areas as London is placed on Lockdown.
Police are asking people to avoid the following areas: Parliament Square; Whitehall; Westminster Bridge; Lambeth Bridge; Victoria Street up to the junction with Broadway and the Victoria Embankment up to Embankment tube.
This is to allow the emergency services to deal with the ongoing incident.
Police were called at approximately 14:40 hours to reports of an incident in Westminster Bridge, SW1. It is being treated as a firearms incident.
Officers – including firearms officers – remain on the scene and we are treating this as a terrorist incident until we know otherwise.
Police are appealing for any members of the public who may have images or footage of the incident to send them to this address: