U.S. bombs Iran's civilian infrastructure for first time after "stone ages" threat

The U.S. military on Thursday attacked major civilian infrastructure in Iran for the first time, hours after President Trump threatened in a prime time address to bomb the country "back to the stone ages."Why it matters: The attack on the B-1 bridge near Tehran signals a widening of the U.S. military's targets and could be a first step towards attacks on energy, water and transportation infrastructure.Trump has said the U.S. could conduct such attacks, which would have devastating effects for Ir...