U.S. equips warplanes with 'bunker busting' bombs to deter Iran.

The US military has equipped its attack aircraft with 250-pound "bunker-busting" bombs for the first time, in an effort to deter Iran. The move is aimed at giving pilots a greater chance of success in destroying ammunition bunkers and other entrenched targets in Iraq and Syria, where US forces have been repeatedly targeted by Iran-backed fighters.