U.S. Says It's Killed 20k ISIS Fighters

The U.S.-led bombing campaign against ISIS has killed some 20,000 fighters, according to a senior military officer. This is a marked increase from the 15,000 reported by the Pentagon in July. There have been more than 7,300 airstrikes since the bombing campaign began in August 2014 and the U.S. strategy against the Islamic State has cost over $4 billion.