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Why is that significant and why would investigators be looking at that mark on the sidewalk? >> that's a thermal burn mark caused by the thermal ball that you saw in the explosive video, followed by the smoke cloud going upward with white smoke. but on the ground you'll also see in front of the two windows about 20 feet across and 2 feet from the building line outward toward the curb, a white substance. >> yeah, we see it. talk about it. what are we looking at, in your opinion? >> my opinion is that may be unexploded tertiary explosive, nitrate similar to that used in the '93 bombing of the wo...

This bomb was bigger than actually we thought at first, but it failed to function as designed. it didn't have enough energy to completely cause a work effect and total destruction of the explosive product. so, it didn't function fully. >> thank goodness if that is, in fact, the case. mr. berry, we want to thank you for your expertise. we thank you for joining us this morning. >> you're welcome. good night. >> good night. all right, coming up, we'll go back to boston and talk about explosions and how they've impacted the security there. >> coast to coast, how big cities are putting safety fir...

Why is that significant and why would investigators be looking at that mark on the sidewalk? >> that's a thermal burn mark caused by the thermal ball that you saw in the explosive video, followed by the smoke cloud going upward with white smoke. but on the ground you'll also see in front of the two windows about 20 feet across and 2 feet from the building line outward toward the curb, a white substance. >> yeah, we see it. talk about it. what are we looking at, in your opinion? >> my opinion is that may be unexploded tertiary explosive, nitrate similar to that used in the '93 bombing of the wo...