NTSB: Fan Blade Cause Of United jet's Engine Failure Written 7 March 2018

The AP reports that investigators have found that the failure of an “engine fan blade caused a United Airlines jet to lose power in one of its two engines over the Pacific last month.” The NTSB “said Tuesday that a fan blade separated and led to the loss of the cover on the right-side engine” of the carrier’s Boeing 777 aircraft February 13. The preliminary report did not indicate what caused the “initial failure of the blade in the Pratt & Whitney engine.” 
More Info (Associated Press)