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A man carries his bicycle past debris and burning cars following reported airstrikes in the town of Hamouria in the eastern Ghouta region, a rebel stronghold east of the Syrian capital Damascus, on December 9, 2015. The Syrian Observatory for Human Rights reported at least 11 civilians, including four children, were killed in strikes on the town of Hamouria, but said it was unclear if they were carried out by Russian or regime aircraft. AFP PHOTO / SAMEER AL-DOUMY / AFP / SAMEER AL-DOUMY AND - (Photo credit should read SAMEER AL-DOUMY/AFP/Getty Images)

A man carries his bicycle past debris and burning cars following reported airstrikes in the town of Hamouria in the eastern Ghouta region, a rebel stronghold east of the Syrian capital Damascus, on December 9, 2015. The Syrian Observatory for Human Rights reported at least 11 civilians, including four children, were killed in strikes on the town of Hamouria, but said it was unclear if they were carried out by Russian or regime aircraft. AFP PHOTO / SAMEER AL-DOUMY / AFP / SAMEER AL-DOUMY AND -        (Photo credit should read SAMEER AL-DOUMY/AFP/Getty Images)