(AP) Here's a look Back at some of the key events in the Syrian uprising as the conflict marks its third anniversary:
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March 2011: Protests erupt in Daraa, Syria, over security forces'
detention of a group of boys accused of painting anti-government
graffiti on the walls of their school. On March 18, security forces open
fire on a protest in the southern city, killing four people in what
activists regard as the first deaths of the uprising. Demonstrations
spread, as does the crackdown by President Bashar Assad's forces.
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June 2011: Police and soldiers in Jisr al-Shughour in northeastern
Syria join forces with the protesters they were ordered to shoot, and
the uprising claims control of a town for the first time. Elite
government troops, tanks and helicopters retake the town within days.
- August 2011: U.S. President Barack Obama calls on Assad to resign and orders Syrian government assets frozen.
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July 2012: A bombing at the Syrian national security building in
Damascus during a high-level government crisis meeting kills four top
officials, including Assad's brother-in-law and the defense minister.
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Summer 2012: Fighting spreads to Aleppo, Syria's largest city and its
former commercial capital. Over time, rebels seize control of about half
of the city, but the battle there rages to this day, leaving much of
Aleppo in ruins.