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tried to get shots of their loved ones crossing the finish line, and they may have inadvertently captured not only either one or both of these explosions but something else that may prove helpful to law enforcement in the coming hours, days and weeks. >> if you see something, say something, and that's what they're counting on, but the investigation obviously is just beginning here, and so much now. >> much more ahead on "nbc nightly news". -- >> bring out the best in others, the ones they seek to harm. >> right, there's still discussion obviously whether this was international terror...

massachuset massachusetts, about ten miles from here. questioning some people. they won't label them as suspects. >> they won't. they questioned a couple of men. took materials out of this apartment. not calling them smts. we have to know there are going to be so many leads they're going to be following up on right now. they're going to be checking surveillance cameras. it's a busy downtown area. 2013, there's a camera every year. we know now there were two explosive devices. you may recall in the hours and even up rough last night there were reports of unexploded bombs. that's becau...

and good morning, welcome to a special edition of "today" on this tuesday morning as we cover a story still unfolding at this hour. i'm savannah guthrie. matt lauer is in boston this morning in what is obviously an emotional and terrible day to you. >> it's a sad and surreal tuesday morning, it's sunny just like it was yesterday for the running of the marathon but this city has now been changed. i'm at the corner of boylston and arlington street, i have been to the finish of this race on a number of occasions. it was packed with people standing side by side looking to see if they cou...