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TOPSHOT - Medical staff at Damascus Countryside Specialised Hospital hold placards condemning a suspected chemical weapons attack on the Syrian town of Khan Sheikhun, during a gathering to show solidarity with the victims in the rebel-held Douma on the outskirts of Damascus on April 6, 2017. US forces fired a barrage of cruise missiles at a Syrian airbase on April 7 in response to what President Donald Trump called a "barbaric" chemical attack he blamed on the Damascus regime. Syria's regime has denied any use of chemical weapons and state media on Friday described the US strike -- which was reported to have pulverised the base and killed at least four servicemen -- as an "act of aggression". (Photo by Sameer Al-Doumy / AFP) (Photo by SAMEER AL-DOUMY/AFP via Getty Images)