U.S. official: 'Psychological blow' in ISIS killing of Iranian general in Syria

The death of a top Iranian military commander in Syria this week has dealt a "psychological blow" to elements backing Syrian President Bashar al-Assad, according to a U.S. intelligence official.

The killing of a commander in the Revolutionary Guards Corps at the hands of ISIS also highlights the extent of Iranian involvement in Syria and the dire straits in which Assad finds himself, Washington-based analysts say.