large crowd of people around him can be seen to react to that first explosion. then he walks away without his knapsack. having left it on the ground where he had been standing. approximately 10 seconds later, an explosion occurs, in the location where bomber 2 had placed his knapsack. we have team fox coverage tonight. adam housley at the hospital in boston. first to catherine herridge in our d.c. newsroom. some dramatic information that indictment. >> shep, according to these court documents, some of the most compelling preliminary evidence comes from surveillance video and one eyewitness. during the carjacking thursday night before a shootout with police one of the brothers said, quote: did you hear about the boston explosion? i did that." court records also filed this afternoon show that tsarnaev brothers walked into boylston street together 11 minutes before the explosions, each with a backpack. they split up. one heading for the finish line and the other toward the forum restaurant, the site of the second explosion. 30 seconds before the first