The U.S. Transportation Department is investigating possible price gouging by the five biggest U.S. airlines while train service was disabled between New York and Washington following a deadly Amtrak crash in May, it said on Friday.
Four passengers on the Amtrak commuter train that derailed in Philadelphia last week filed a federal lawsuit on Monday against the U.S. rail service, as operations resumed on the heavily traveled Northeast Corridor.
The United States and France sought on Saturday to play down any disagreements over nuclear talks with Iran, saying they both agreed the accord now under discussion needed to be strengthened.