9/11, deadliest US attack
The September 11 attacks, known as 9/11, were a series of coordinated terrorist attacks by al-Qaeda in 2001. Nineteen terrorists hijacked four planes intended for cross-country flights. Two planes were flown into the Twin Towers of the World Trade Center in New York City, while a third hit the Pentagon near Washington, DC. The fourth plane crashed in Pennsylvania after passengers fought back against the hijackers. (Picture credit: Reuters)
Smoke flows from World Trade Center
Smoke flows from the World Trade Center towers shortly after they were struck by hijacked commercial planes. (Picture credit: Reuters)
People in shock
People passing by react with shock and disbelief as the World Trade Center collapses. (Picture credit: Reuters)
People run from collapsing tower
People run from the World Trade Center tower as it collapses in New York. (Picture credit: AP)
People look out of North Tower
People are seen looking out from the burning North Tower of the World Trade Center during the attacks. (Picture credit: Reuters)
South Tower collapses
The South Tower of the World Trade Center collapses into a cloud of dust and debris approximately half an hour after the first tower fell. (Picture credit: Reuters)
White House chief informs president
Then-US President George W Bush listens as White House chief of staff Andrew Card informs him of the second plane hitting the World Trade Center. Bush was at Emma E Booker Elementary School in Sarasota, Florida, attending a reading event on the morning of the attacks. (Picture credit: Reuters)
Firefighters search through debris
Firefighters tirelessly search through the wreckage of the World Trade Center, combing through debris in hopes of finding survivors. (Picture credit: Reuters)
Rescue workers carry wounded Chaplain
Rescue workers carry the fatally injured New York City Fire Department chaplain, Reverend Mychal Judge, from the ruins of the World Trade Center. Reverend Judge was killed by falling debris while administering last rites to a man on September 11. (Picture credit: Reuters)
Medical team waits for injured
Medical workers at St Vincent's Hospital in New York await the arrival of injured victims from the World Trade Center attacks. (Picture credit: Reuters)
Man walks through debris
A man walks through the streets near the World Trade Center towers in New York City, surrounded by debris and chaos. (Picture credit: Reuters)
American flag flies amid debris
An American flag waves near the base of the destroyed World Trade Center, symbolising resilience amidst the devastation. (Picture credit: Reuters)
Rescue helicopter surveys damage
A rescue helicopter surveys the extensive damage to the Pentagon as firefighters battle flames following a hijacked airplane crash into the US military headquarters near Washington, DC. (Picture credit: Reuters)
Officials at Emergency Operations Center
President George W Bush is seen with Vice President Dick Cheney and senior staff in the President's Emergency Operations Center in Washington, DC, in the hours following the 9/11 attacks. (Picture credit: Reuters)