Firefighters search the rubble of the destroyed World
Trade Center in New York on September 11, 2001. Rescuers
searched for survivors the day after two hijacked
passenger planes slammed into the Center's 110-story twin
towers, killing possibly thousands of people. Two police
officers were pulled alive from the rubble late Tuesday,
more than 12 hours after the attack, raising a ray of
hope for others. But eyewitnesses and emergency workers
said they were skeptical that many survived. (Shannon
Stapleton / Reuters)