forum and said terrorists continue to look at, quote, simple forms of chemical or biological weapons, something like the poison ricen which is easy to make he says. he went onto say, quote, we still have pockets of al-qaida around the world who see this as a keyway to fight us. is it going to kill many people? no. is it going to scare people? yes. osama bin laden favored larger attacks he said, but his successors and the al-qaida off shoots in the arabian pennsylvania and elsewhere believe the goal is to instill fear in americans and other westerners and they don't feel they need a large scale attack to do that. jon: what do these former counter terror officials think about the tactics of al-qaida's new leader ayman al-zawahri. >> reporter: osama bin laden's former right hand man has long been interested in using weapons of mass destruction to attack. according to former cia director