This photo released by the Syrian Civil Defense White Helmets, which has been authenticated based on its contents and other AP reporting, shows smoke rising after Syrian government airstrikes hit in the town of Douma. (Syrian Civil Defense White Helmets via AP)

This photo released by the Syrian Civil Defense White Helmets, which has been authenticated based on its contents and other AP reporting, shows smoke rising after Syrian government airstrikes hit in the town of Douma. (Syrian Civil Defense White Helmets via AP)