Statements from the Mayor on the attack in Manchester
24 May - Mayoral statement on 'critical' national threat level
The national threat level has now been raised to 'critical' on the advice of security experts in the aftermath of the barbaric terrorist attack on Manchester. This is the highest level of security preparedness in the UK.
I want to reassure all Londoners and visitors that we are doing everything possible to protect our city. As your Mayor, I am in constant contact with the Metropolitan Police and we are liaising closely with the Government and security services.
Our emergency services prepare day in, day out for these situations. Our plans are well rehearsed and well prepared. I would urge all Londoners and visitors to remain calm and vigilant, and to report anything suspicious to the police.
There will be additional police officers on London's streets over the coming days - including additional armed officers. You will also see some military personnel around London - they are there to help our police service to keep us safe and guard key sites.
London stands in solidarity with the people of Manchester. Those who seek to harm and divide us through barbaric acts of terrorism will never succeed. We will never be cowed by terrorism.
23 May - Statement from the Mayor on the attack in Manchester
London stands united with the great city of Manchester today after this barbaric and sickening attack. This was a cowardly act of terrorism that targeted a concert attended by thousands of children and young people.
My heart goes out to the victims, their families and everybody affected. Once again we have seen the heroism of our brave emergency services. They have our full support and are in all our thoughts today.
I am in constant contact with the Metropolitan Police, who are reviewing security arrangements in London. Londoners will see more police on our streets today.
Manchester and the rest of Britain will never be cowed by terrorism. Those who want to destroy our way of life and divide us will never succeed.