Security for New Year’s Eve celebrations across London has been reviewed, Scotland Yard says.
Hundreds of thousands of people are expected to celebrate in London on 31 December.
They can expect to see armed police on patrol, plus dog units and vehicle barriers, Superintendent Nick Aldworth said.
“The policing plan has been developed and reviewed following the tragic incidents that have occurred through the year,” Mr Aldworth said.
“Whilst there is no specific threat to this event, we ask people to remain vigilant and report anything suspicious to an officer or event staff.”
Around 100,000 ticket-holders to this year’s traditional New Year’s Eve fireworks display will watch the 12-minute spectacle light up the skyline from the bank of the River Thames on Sunday.
It will feature a soundtrack dominated by female artists to mark the centenary of women being allowed to vote.
The event is now sold out so Scotland Yard advised people without a ticket to watch “from the comfort and warmth of your home”.
A spokeswoman for London Mayor Sadiq Khan said: “The safety of Londoners is the mayor’s number one priority.
“He and his team are in close contact with the Metropolitan Police, TfL and other key agencies, and we have appropriate plans for security in place.
“Of course we encourage everyone coming to the event to be vigilant and to report anything of concern to a steward or police officer.”
London was hit by four major terrorist incidents in 2017, including March’s attack on the palace of Westminster which saw five people including PC Keith Palmer killed, and June’s attack at London Bridge, which left eight people including three terrorists dead.
“We will have the right response of officers at the right locations; this will be a mix of overt and covert officers deployed, as well as dogs, and the use of CCTV and automatic number plate recognition,” says Mr Aldworth.
“People can expect to see armed officers in the area, and we will be using vehicle barriers across the event area.
“Security is paramount for us, and so we ask for patience and co-operation when getting through the check and search points.”
There will also be a strong security presence around Greater Manchester for the New Year’s Eve celebrations.
Twenty two people were killed in a bombing at an Ariana Grande concert at Manchester Arena on 22 May.
Greater Manchester Police told Sky News: “There will be operational work that’s ongoing around Greater Manchester to make sure people feel safe.”