By David Shepardson and Allison Lampert

WASHINGTON (Reuters) -The U.S. Federal Aviation Administration on Saturday issued an order prohibiting MD-11 planes from flying for now, pending inspection, after a fiery crash this week of a UPS MD-11 cargo freighter killed at least 14 people in Louisville, Kentucky.

UPS and FedEx said they have already grounded their combined fleet of more than 50 McDonnell Douglas MD-11 cargo planes following a recommendation by planemaker Boeing.

The FAA said its emergency airworthiness directive was prompted by the crash on Tuesday in which the left engine and pylon detached from the airplane during takeoff. The cause of the detachment is under investigation.

“This condition could result in loss of continued safe flight and landing,” the U.S. regulator said.

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