The official London receives condolences from world leaders.

US President Donald Trump spoke by phone to British Prime Minister Theresa May to offer his condolences and to praise the effective response of UK security services.
Mr Trump pledged the "full co-operation and support" of the US government in bringing those responsible for the attack to justice, the White House said in a statement.

Leaders of France and Germany, which suffered deadly vehicle attacks last year, offered the UK their support.

"I want to say for Germany and its citizens: we stand firmly and resolutely by Great Britain"s side in the fight against all forms of terrorism," said Angela Merkel.
President Francois Hollande expressed his "solidarity" with the British people, saying "terrorism concerns us all and France knows how the British people are suffering today".
In Paris, the lights of the Eiffel Tower went out from midnight in a tribute to the victims.

The EU Commission President Jean-Claude Juncker, European Council President Donald Tusk and NATO Secretary General Jens Stoltenberg expressed their condolences.