produce mass casualties. there are so many people along that finish line, that whoever planted these bombs wanted to kill and mame lots of people. >> there are certainly a lot of unanswered questions tonight. definitely it was terrorism. we don't know if it was home-grown or foreign but it was terrorism and intended to hurt a lot of people and, indeed it did. i imagine when the bombs went off everybody just running? is that it? the nonrunners, spectators took off running? >> it was kind of interesting where i was. the atmosphere after the boston marathon is so full. it's joyous, the weather was beautiful today. people were just having fun, laughing, meeting up with family members. and when these two explosions went off, it was almost like a hush fell across the city. you know, everybody just stopped and said what was that? yeah, the people who were on