Officers from specialist Metropolitan Police Service units took part in a security engagement operation on and around the River Thames in Southwark, Lambeth and Westminster on Wednesday.
The Met says that the operation – which involved the marine policing unit, dog support unit, traffic command and local police – was designed to increase awareness of 'protective security' in London and remind the public of the vital role they can play in helping to protect the capital.
The operation included high visibility patrols, vehicle checkpoints and engagement with the public and local businesses along the River Thames.
"Everyone has a role to play in keeping London safe from terrorism and this operation sees specialist officers working with local police and communities along the River Thames to counter that threat and prevent other crime," said Detective Superintendent Marshall Kent.
"The threat to London from terrorism remains real and serious so we encourage the public to remain vigilant and alert and to report anything suspicious to police."
Anyone who has any information about unusual activity or behaviour should contact the confidential anti-terrorist hotline on 0800 789 321.