Vice President Joe Biden says there is no doubt that Syrian President Bashar Assad's government is responsible for the heinous use of chemical weapons.

Biden's comments Tuesday make him the highest-ranking U.S. official to say the Syrian regime is the culprit in a large-scale chemical weapons attack on Aug. 21.

Biden says the Syrian government is the only actor in the 2-year civil war that possesses and can deliver chemical weapons. He says Assad has blocked U.N. investigators...read more here: Biden says no doubt Syrian government used chemical weapons