Obama has said that use of such weapons would lead to war between Syria and the U.S.
Read more...Syria delivered a letter of protest to the U.N.
Read more...71 young men were killed execution-style in the Syrian city of Aleppo.
Read more...The U.N. chief urges international leaders to help end the conflict.
Read more...Lakhdar Brahimi has agreed to replace former Secretary-General Kofi Annan.
Read more...Rebels are trying to take Syria's largest city by force.
Read more...U.S. Secretary of State Hillary Clinton has accused the Syrian army of deliberately murdering civilians.
Read more...The 300 observers will remain in Syria but will not be monitoring the ceasefire.
Read more...The violence continues even with a cease fire that went into effect April 12.
Read more...Attack happened one day after Security Council voted to send more observers to country.
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