(The Hill) - FedEx and UPS on Friday announced a temporary ground stop for fleets of McDonnell Douglas, or MD-11, cargo planes following a deadly crash in Louisville, Ky., earlier this week that killed at least 12 people.

"MD-11s are approximately 9 percent of the UPS Airlines fleet," according to UPS in a short statement. "The grounding is effective immediately. We made this decision proactively at the recommendation of the aircraft manufacturer."

The company added, "Nothing is more important to us than the safety of our employees and the communities we serve."

FedEx confirmed with The Hill that it was also grounding MD-11 fleet "as we conduct a thorough safety review based on the recommendation of the manufacturer."

"We are immediately implementing contingency plans within our integr

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