"People across Europe have been invited to pause at 1200 BST today in remembrance of the dead and injured from last week's London bombings. City mayor Ken Livingstone wants people to come out onto the streets to pay their respects to the fallen. Every bus in London will come to a halt, he said, and a book of condolence will be opened in Trafalgar Square," says Downing Street.
The mayor has also opened a book of condolence online, here.
It's OT [off topic] for Onlineblog but there is nonetheless a discussion taking place in the comments to an earlier post, We are not afraid.