Security was tightened at U.S. installations worldwide after the Aug.7 bombings of the U.S. embassies in Kenya and Tanzania. Saudi dissident Osama Bin Laden is wanted by U.S. officials for those attacks. The Taliban movement in Afghanistan might consider putting Osama bin Laden on trial for a 1996 bomb attack that killed 19 American airmen in Saudi Arabia. Urged on by the Clinton administration, Saudi Arabia's top intelligence official met privately with the leader of the Taliban in late September to try to persuade Afghanistan to deport Osama bin Laden.