Shocked and appalled by the terrible scenes in Boston last Monday, but very moved by the outstanding reactions of support, solidarity and love shown by the people on the scene and around the world.
The bomb hit after the elite runners had finished - it was time for the people running for charity to cross the line. They raised $11 million and proved that for every terrorist there are many more people who are kind and humane. Some of the first to help victims had just completed running for four hours and then turned around and triaged amputees. Others continued to run to the hospital to donate blood.
Having completed the Virgin London Marathon, I know that once you run a marathon you join a global community - and other marathon runners will continue to honour the memory of those lost in Boston.
The Virgin London Marathon will go ahead this weekend andI will be there with my children, as will hundreds of thousands of other supporters. We are not going to change our way of life, we are going to carry on focusing on the wonderful things that can improve peoples lives.
The Virgin London Marathon will donate 2 for every finisher in Sundays race to The One Boston Fund set up by the Boston Marathon to raise money for victims. They expect to raise more than $100,000 for the fund and are encouraging all London Marathon runners and supporters to make their own donations too. There will be a period of silence at the start of the race and runners will wear black ribbons as a show of solidarity with all those affected in Boston.
As Virgin London Marathon chief executive Nick Bitel said: "One of the great things about the London Marathon is that it is always seen as an event that brings everyone together. One of our founding objectives was to unite people in a troubled world and we are determined to stick to that principle."
We are looking forward to the race on Sunday. The London Marathon is always one of the most wonderful, emotional and inspirational days of the year - this year will be no different.