saudi arabia busts up a major terrorist offensive. officials say they've or rested more than 100 people accused of plotting attacks on police and oil refineries. cnn's senior national correspondent nic robertson is in london. what have you learned? >> the saudi officials say that in october last year they busted a small group of people that they then followed the leads from that small group and it led to rounding up 101 different people over the past five months. they say 47 of them are saudis. 52 are yemenis. one bangladesh and ethiopian. this is part of a large network that was conspireingwed saudi a attack policemen, video recording equipment, computers, a lot of equipment. and they say the saudi authorities also say that they have busted two other cells, two six-man cells that were planning