four attack aernz the u.s. emphasis is now telling nbc news that they have no knowledge of any americans at the site of the attack. also, an update here on breaking news from syria where coalition forces say a u.s. warplane shot down a aircraft dropping bombs near where u.s. backed forces were located. the incident in northern syria, coalition saying that they contacted the russian military and in an effort to dekaes late the situation. more information on both of those stories any time we get it. and now this. >> the water was bad. the water coming in from the flint river really was corrosive. it corroded the pipes of the homes and the school and the shops and flint and when it corroded the pipes, it released into the tea kettles and water glasses and shower spray and sippy cups of plint poisonous lead. it corroded the pipes. it released the lead holding the pipes together. the people of flint drank that water and now filled with lead and it made them sick. >> that is the background for tonight's edition of "normal or