STORIFY: Reactions and video of Wednesday's horrific violence.
Read more...The violence continues even with a cease fire that went into effect April 12.
Read more...Annan called for every armed Syrian to lay down their weapons.
Read more...Syrian officials deny responsibility for what is being called one of the bloodiest events in the 15-month-uprising in Syria.
Read more...The violence came as retribution for a large anti-government protest Friday.
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