Boeing has recommended that airlines ground its fleet of 777 planes after one malfunctioned mid-air near Denver, Colorado.

United Airlines flight 328 from Denver International Airport to Honolulu, Hawaii, turned around shortly after takeoff once pilots reported an engine issue on Saturday. The pilots landed the plane safely, and no injuries were reported, even as debris fell from the plane and landed in the residential town of Broomfield, a suburb about 20 miles from Denver, according to the local police department.