already purchased their tickets. reporter: and wolf, we have seen very long lines of predominantly russians lining up to buy tickets at some of the various ticket sales points that we ve seen around sochi. you know, hundreds of people waiting, in fact, in line. and when that cauldron, that olympic cauldron over my shoulder, when it was lit, there was a massive fireworks display here. you can just hear russians in the houses in this neighborhood cheering, whistling, again, a big moment of pride for this country, clearly. let s hope it goes smoothly and quietly with a lot of great athletes performing. thanks very much, ivan watson, in sochi. we re learning more about the potential olympic terror threats, though, in addition to concerns about a toothpaste type of tube bomb, u.s. authorities also telling our jim sciutto they re particularly concerned about suicide attacks as well as homemade bombs or ieds against