As hundreds of thousands of people descend on the capital for the world-famous Notting Hill Carnival, police have issued advice on keeping safe.
It follows recent tragic incidents in Barcelona, in which 15 people were killed, and a spate of violent knife and acid attacks on London's streets.
Metropolitan Police has said it wants everyone to enjoy carnival this Bank Holiday weekend by "taking care and keeping safe."
The force has thoroughly reviewed its security plans for the event to make sure the event is as safe as it can.
Notting Hill Carnival
Last year, 105 arrests were made and five people were stabbed - four of them, including two 15-year-old boys, within half an hour - on the first day of carnival.
In total across the 2016 event, more than 400 arrests were made and medics treated more than 600 people.
This year, CCTV will keep a bird's eye view over the event, giving officers an additional tool to keep the crowd safe, stop crime and catch any criminals.
Met Police's "super recognisers" will be operating from a live CCTV control room. These officers will seek out anyone who has bail conditions which prohibit them from attending, plus offenders committing crime.
Top tips for keeping safe
o Tubes and buses will be busy, so plan your journey in advance;
o Sunday is children's day and traditionally less crowded;
o Move along the whole of the route;
o Go with the flow of the crowd - don't try to walk against it;
o Have a set meeting place in case you lose family or friends - try not to rely on your mobile phone;
o Don't bring your valuables or wear expensive jewellery;
o Keep your belongings with you at all times;
o Don't carry too much cash or your credit cards;
o Police officers are there to help - sometimes they may ask you to walk a longer route but this will be for the safety of you and others.
What Met Police says
Chief Superintendent Robyn Williams, spokesperson for the policing operation for carnival, said: "We've been working hard with everyone involved in the carnival to make sure that thousands of people can take to the streets of west London and have a brilliant time, knowing that we are doing all we can to keep them safe.
"Whilst sadly London is no stranger to terrorist attacks and we are used to policing our city and big events against that backdrop, the terrible events in London this year and recently in Europe are a tragic reminder that the threat from terrorism remains ever present.
"The importance of carnival in London's cultural calendar has only increased - this is an opportunity for the world to see the strength of our city. We are determined to do absolutely everything to make sure revellers enjoy it.
"With the tragedy of Grenfell Tower still so raw for the community of West London we have put in place a specific policing operation around that area.
"It is a reality though that last year the number of people arrested at the event was the highest it has been for a decade. The Met has been working incredibly hard to tackle some emerging and growing crime trends - specifically knife crime and acid attacks.
"No one wants to see carnival being used this weekend as cover by those planning to commit crime, hurt each other or endanger those enjoying themselves.
"We will be working hard - on the streets of Notting Hill and across the whole of London - to keep people safe and prevent crime."
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