President Obama announced plans to greatly reduce the number of US forces in Afghanistan, to conclude combat missions in the country this year and to end the US military commitment by the end of 2016.
The president acknowledged that US forces had been in Afghanistan for longer than expected, but said they were now at the stage to plan to "finish the job we started."
More top news
Through the day, most of the cloud should break up to leave fine conditions for many with spells of sunshine.
The Eiffel Tower in Paris was plunged into darkness, with the Burj Khalifa in Dubia emblazoned with the Union Jack.
The major party leaders' campaigns for the General Election will remain suspended on Wednesday following the Manchester terror attack.