Flags are flying at half-staff today, Sept. 11, across California and the United States for Patriot Day.

On Sept. 11, 2001, terrorists launched an attack on American soil, killing almost 3,000 people in New York City, Washington, D.C., and in a Pennsylvania field.

Patriot Day honors the memory of those victims and the first responders and service members who served after the attacks.

On Sept. 11, 2001, al-Qaida launched a series of terrorist attacks against the United States, killing almost 3,000 people.

Terrorists hijacked four passenger planes. Two planes crashed into two towers at the World Trade Center in New York City, and another crashed into the Pentagon outside Washington, D.C.

A fourth plane crashed into an empty field in Shanksville, Pennsylvania, after passengers tried to t

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