The U.S. now has blood and urine samples from last Saturday's deadly attack in Syria that have tested positive for chemical weapons, according to two U.S. officials familiar with the intelligence.

The U.S. now has blood and urine samples from last Saturday's deadly attack in Syria that have tested positive for chemical weapons, according to two U.S. officials familiar with the intelligence. https://t.co/y2lNYjsIlM

— NBC News (@NBCNews) April 13, 2018