Pulitzer Prize-winning investigative reporter Seymour Hersh, the journalist who exposed the My Lai massacre of Vietnamese women, children and old people by US troops, the Abu Ghraib prison torture scandal in Iraq, and many other critically important stories, has now obliterated the US government's (and the US media's) claim that Syrian President Bashar al-Assad's military killed nearly 100 people with a Sarin nerve gas bombing in April, an incident which prompted President Trump to order a Tomahawk cruise missile attack on a Syrian Air Force base.