The US civil aviation regulator ordered Saturday that all MD-11 cargo planes remain grounded for inspections, after one of them was involved in a deadly crash in Kentucky this week.

A McDonnell Douglas MD-11 aircraft operated by UPS exploded into flames when it crashed shortly after departing Tuesday from the airport in Louisville, killing at least 14 people. A three-person crew was aboard.

Freight carriers UPS and FedEx later grounded their MD-11 fleets, while Boeing, which owns McDonnell Douglas, said it had recommended that all operators suspend their use of the planes.

On Saturday, the Federal Aviation Administration issued an emergency directive that "prohibits further flight until the airplane is inspected and all applicable corrective actions are performed."

The directive applie

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