LOUISVILLE, Ky. (AP) — Federal aviation officials issued an order Saturday for McDonnell Douglas MD-11 planes not to be flown pending further inspection, reinforcing cargo carriers’ decision to ground their fleets following a deadly crash at the UPS global aviation hub in Kentucky.

UPS and FedEx said Friday that they were grounding their fleets of McDonnell Douglas MD-11s “out of an abundance of caution,” and the Federal Aviation Administration's directive the following day sidelined the planes until inspection and correction of any problems. In the Louisville crash, the jet's left engine detached during takeoff.

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