I am shocked and horrified, as we all are. Boston is a city I love visiting and know well. And the marathon is an event with great energy and a spirit of optimism.
It seems particularly cruel to target such an event, but the kind of evil that targets innocent people with bombs is by definition cruel.
My thoughts and prayers are with those injured, the families who have lost loved ones, and the police and health care workers who have had to cope with this dreadful tragedy.