Boston Reporter: Bombs Deliberately Planted for High Casualties

Boston Globe reporter Dave Abel says the explosion sites were highly congested at time of blasts.
2:47 | 04/16/13

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Transcript for Boston Reporter: Bombs Deliberately Planted for High Casualties
I -- David -- Boston Globe reporter David thank you for joining us you're right on the finish line. At the moment the first blast went -- tell us about what you sorry. So I was scared taking video as runners were coming in. Win and I felt the ground shake and -- very massive and I saw -- large. A little while to figure out what exactly. Any sense of what -- good. A lot of people asking this question at this point you know at first there's the normal things filtered through your mind today. Explanation was that -- malfunctioning piece of -- name was. Celebratory gunfire from the incoming runners Hillary jubilation. But -- seen as smoke cleared and the neighbors say. We knew it happened and you saw the -- on the ground he. Pretty much immediately -- you think -- onto my heat and smoke cleared the carnage became visible and it was really the most horrific thing -- How what was the scale of the life. So it's a pretty congested place their C. Viewing stand immediate Stanley's sort of over the finish line I was actually -- on the finish line. Has scores of runners were coming in every meaning. On both sides there are spectators and whoever planted this bomb did it deliberately because they knew how to maximize then the casualties. Because invariably. -- he's run three marathons straight Boston marathons. Walk running onto Boylston street behind compared to like hitting a home run at Fenway Park there -- -- devastating war. There are ten people. As spectators. And so where these bombs -- planted where the most important place for all the friends and family com to greet him marathon. It also seemed to have been tied for the moment when you have the highest volume of -- crossing the finish line. Time yeah you know it was about the four hour mark probably a little after the that's probably when most of the runners for charity named sir yeah others. Number of runners time. When things -- was also remarkable about all this you can see some letters -- we have right there the emergency responders sprang into action saved. If there's anything he can -- is -- from this experience was million in the moments after the big -- in the second bomb. Split it and -- on top police officers now. Tears spectators. -- strangers helping strangers -- -- metal barricades. Carrying people. With the worst possible injuries by. -- fifty feet away.

This transcript has been automatically generated and may not be 100% accurate.

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