By Daphne Psaledakis and Parisa HafeziWASHINGTON/DUBAI, Sept 1 (Reuters) - The U.S. launched a barrage of airstrikes against Iran on Tuesday, prompting Iranian retaliation, in the most serious escalation in weeks in a conflict that has driven up global energy prices and weighed on President Donald Trump's popularity at home.

First exchange of fire between two countries in more than a month sends oil prices rising 3%

The U.S. launched fresh airstrikes against Iranian targets Tuesday, raising fears of a broader return to hostilities as Tehran threatened to choke off Gulf...