Intelligence chief: Al-Qaida wans to attack US

Director of National Intelligence Dennis Blair says Al-Qaida will continue to try to attack the United States until Osama bin Laden and his No. 2 Ayman al-Zawahri are dead.

Blair and CIA Director Leon Panetta are among top intelligence officials outlining to Congress Tuesday the main threats facing the United States. Their annual threat assessment comes just weeks after a failed attack to bring down an airliner over Detroit. International terrorism again heads the list.

Blair also said the U.S. still does not know the intended targets of suspected terrorist Najibullah Zazi, who was arrested in September and charged with plotting to attack New York City with homemade bombs. And Blair said U.S. intelligence continues to believe that alleged Fort Hood shooter Maj Nidal Hassan is a homegrown extremist rather than a terrorist who worked with militants abroad.