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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...

other places, in the united states we have to be aware that perhaps more of that will be coming our way. >> reporter: the investigation started almost immediately, officials cordoned off blocks around the bomb site in order to allow bomb squad detectives to sweep the area for more explosive devices. early tuesday morning, we learned federal and local authorities are searching an apartment of someone they call a person of interest in a boston suburb of revere. >> this is a very thorough and active and fluid investigation. >> reporter: police searched surveillance cameras in the area, ...