Saturday: In this picture provided by the Syrian opposition's Shaam News Network, people watch the mass burial of victims from Friday's violence in Houla. AFP/Getty Images hide caption

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Activists say this image, taken from a video uploaded to YouTube, shows Syrians outside a field hospital in Homs earlier today. Blood stains the sidewalk. Because few foreign journalists are inside Syria, images such as this cannot be independently verified. AFP/Getty Images hide caption

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