The US has offered assistance to the UK as police are dealing with a suspected terror attack which occurred in Westminster, London, on 22 March. Four people have been confirmed dead, including a stabbed policeman and the attacker.
In a seemingly related incident on Westminster Bridge, a woman was confirmed dead while a number of others were injured.
As armed police are dealing with the incident, world leaders are sending messages of support and solidarity.
The Dutch prime minister, Mark Rutte, said: "Horrible images from London. The very heart of the city has been struck. Our thoughts are with the British people."
Gibraltar's chief minister, Fabian Picardo, said: "Shocked at attack on London. Yesterday I spent the day at Westminster. Luckily not today. London's Parliament is the mother of democracy!"
Belgian Prime Minister Charles Michel said: "Our condolences are with those who mourn and all who are affected in London. Belgium stands with UK in fight against terror."
France's former president, Nicolas Sarkozy, said: "In Westminster, it is the heart of democracy that was attacked. My support and heartfelt thoughts go to our British friends."