launch the missile strike against the assad regime. the latest from our security correspondent, jim sciutto. as always, in the case of syrian stories, we must warn you, some of the images in his report are graphic. the u.s. military the investigating whether russia was complicit in the syrian regime's gruesome chemical weapons attack on civilians earlier this week. whether a russian war plane dropped a bomb on victims of the attack five hours later, perhaps to destroy evidence. u.s. intelligence shows that a russian drone flew over the hospital site just before the bombing. the probe comes after president trump ordered a barrage of missiles on a seyrian air base n retaliation for the deadly attack. the first u.s. military strike