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Secretary of defense says the united states has evidence that chemical weapons have been used in Syria.
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President Obama declares that Syria has crossed a "red line" with their use of chemical weapons. His administration steps up support of Syrian rebels.
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The UN begins an investigation in Northern Syria after videos on the internet show as many as 30 people being executed.
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The UN calls for another investigation after activist groups state that 1,300 people were killed. They claim that chemical weapons were used.
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The UN passes a resolution that requires Syria to destroy all of their chemical weapons.
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Over 23 people are killed during an airstrike
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Dozens of civilians are killed in a suspected chemical attack
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The us launches a military strike on Syrian Government airbase after the civilian chemical attack.
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Over 1,00 children are killed and injured
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Helicopters drop chemical bombs on the last rebel-held town. Over 500 people are affected by the attack.
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The US, France, and the UK launch airstrikes on Syria after the chemical attacks in Eastern Ghouta
