U.S. and Iran escalate exchange of strikes: The U.S. and Iran had significant escalations in fighting this week. The U.S. military launched more strikes on Thursday than at any other point since a fragile ceasefire was established between the two countries. CBS News senior national security correspondent Charlie D'Agata reports. #USIranRelations #MilitaryConflict #Ceasefire #NationalSecurity #MiddleEastTension