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Debris fallen from a United Airlines airplane's Boeing engine on the neighborhood of Broomfield, outside Denver, Colorado, on Saturday.

The Federal Aviation Administration (FAA) said Sunday it now requires "stepped up" inspections of Boeing 777 aircraft that contain the same engine model that failed on a United Airlines flight over Denver this weekend.

Why it matters: United and Japanese regulators have grounded Boeing 777s with the same Pratt & Whitney PW4000 engines as the jet involved in the Denver incident.