correspondent greg palkot is in berlin. reports they have a man in custody but perhaps not the right man? >> a man in custody, harris, you are right, they are not sure he's the one they want. a city on edge right now, as people mill around here, we are standing in front of a scene of terror when a 7 1/2 ton truck ran into a christmas market filled with people. more information about the casualty toll. 12 killed, 6 germans, 1 polish, we don't know about the nationalities of others. 48 injured, 18 seriously. waiting on nationalities of them as well. yes, we don't know who did it. police think they had the right guy, a 23-year-old pakistani asylum-seeker who was seen fleeing from the scene, they thought he hijacked this truck and rammed it into the crowd and left, but now they're saying perhaps he isn't the right person, perhaps they need somebody else, perhaps they