JASON CARROLL, CNN ANCHOR: The incident at the White House yesterday was certainly not a typical terrorist threat. But it ironically came at the same time as senior intelligence officials were briefing Congress about terror threats to the nation. CNN national correspondent David Ensor was there.</s>DAVID ENSOR, CNN CORRESPONDENT (voice-over): When it comes to terrorism, Osama bin Laden and his network of associates remain the most immediate and serious threat to the U.S., the nation's intelligence chief told Senators, and the danger is growing.</s>GEORGE TENET, CIA DIRECTOR: Terrorists are also becoming more operationally adept and more technically sophisticated in order to defeat counter-terrorism measures.</s>ENSOR: For example, the Internet that has created economic potential has also become the way terrorists communicate, using freely available encryption software to conceal their plans from the</s>CIA. TENET: We're in the modern world. They are in the modern world. And it's not very, very difficult.</s>ENSOR: But Tenet pointed to another threat that may be of even greater concern in the longer term: weapons proliferation. Last year, the CIA director said, Russian entities sold missile technology to India, China, Libya and Iran.</s>TENET: Indeed, the transfer of ballistic missile technology from Russia to Iran was substantial last year.</s>ENSOR (on camera): And the CIA chief worries about secondary proliferation; Russian chemical and biological weapons know-how reaching Iran, for example, that could then be passed on to other states or groups looking for dramatic new weapons for terrorism. David Ensor, CNN, Washington.
Intelligence Officials Brief Congress About Terror Threats