Now that bin Laden's dead, who are al Qaeda's most wanted leaders?

al-Zawahiri in the U.S. crosshairs

STORY HIGHLIGHTS

• Intelligence agencies are stepping-up the hunt for al Qaeda's remaining leaders
• Ayman al-Zawahiri is thought by many security analysts to be the most vulnerable

RELATED TOPICS

• Al Qaeda
• Osama bin Laden

(CNN) -- He was its founder and strategic guiding force, but now that Osama bin Laden is dead, who are al Qaeda's most wanted leaders?

The leaders whose influence and violent ambitions make them high-priority targets by intelligence agencies around the world.