The U.S. Federal Aviation Administration on Saturday said it was prohibiting MD-11 planes from flying for now, pending inspections, after a crash earlier in the week of a UPS MD-11 cargo freighter killed at least 14 people in Kentucky.

The ashes have settled over the charred Louisville neighborhood where nine people remain missing and families cling to hope as investigators comb through the wreckage of Tuesday’s fatal UPS cargo plane crash.

The Federal Aviation Administration grounded all McDonnell Douglas MD-11 aircraft on concerns the engines and its structural wing components could fail as investigations continue into the deadly United Parcel Service Inc.

UPS and FedEx's fleets of MD-11 planes are grounded, which can each carry thousands of packages. Logistics experts say some cargo could shift to passenger planes, trains and trucks.

The UPS cargo plane crew tried to control the aircraft for about 25 seconds before it crashed into a ball of flames shortly after taking off on Tuesday.

Nine people were killed and 11 injured after a UPS MD-11 freighter crashed and exploded shortly after takeoff from Louisville. The NTSB and FAA are investigating, with early focus on a possible engine separation.