announcer: from nbc news headquarters in new york, this is nbc nightly news with lester holt. good evening. authorities in britain and the united states are saying tonight that it appears those explosive packages intercepted overseas friday on their way to the united states were meant to go off aboard airplanes and we ve now learned at least one of the bombs made part of its journey aboard a passenger jet. all weekend investigators have been rapidly unfolding details of the plot which appears much more serious than first thought. meanwhile the search goes on for whoever was behind it. our justice correspondent pete williams joins us with the latest now. pete. reporter: lester, police from three countries are analyzing what was in these passengers. they say both contain nearly a pound of a powerful high explosive. stuffed inside this exact type of toner cartridge for a desktop laser printer. u.s. officials say the bombs were fully operational and cleverly designed to g
announcer: from nbc news headquarters in new york, this is nbc nightly news with lester holt. good evening. authorities in britain and the united states are saying tonight that it appears those explosive packages intercepted overseas friday on their way to the united states were meant to go off aboard airplanes and we ve now learned at least one of the bombs made part of its journey aboard a passenger jet. all weekend investigators have been rapidly unfolding details of the plot which appears much more serious than first thought. meanwhile the search goes on for whoever was behind it. our justice correspondent pete williams joins us with the latest now. pete. reporter: lester, police from three countries are analyzing what was in these passengers. they say both contain nearly a pound of a powerful high explosive. stuffed inside this exact type of toner cartridge for a desktop laser printer. u.s. officials say the bombs were fully operational and cleverly designed to g