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The We're Not Afraid was set up by Alfie Dennan who said the idea came to him from a message to his blog

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A mobile phone image of one of the bombed trains was sent to his site and then someone else added the words '"We're Not Afraid"

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It has been a huge success - four million people visited it on Monday

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Mr Dennan said the site had become a symbol for people to show solidarity with London

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In the past few days about 3,500 photos - from holiday snaps to doctored pictures of London buses and Tube stations - have been sent

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Pictures have been sent in from all over the UK and the rest of the world

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Another blog site, thesharpener.net, is also running a defiant message, pledging a public demonstration to show solidarity with Londoners and defiance to the bombers

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"I set up the website to give people a voice online, to show their distaste for this tragedy, and have received a huge response - I've been amazed," said Mr Dennan