Investigators released their first report on Thursday into how a Ryanair passenger ended up partially sucked out of a plane window.

The National Transportation Safety Board’s preliminary report found that a fan blade broke off from the right engine, and engine fragments damaged the fuselage and shattered a window.

On July 10, the Boeing 737 was operating a flight from Thessaloniki, Greece, to Memmingen, Germany. There were 149 passengers and six crew members on board.

As the plane was climbing through 16,000 feet, the pilots received a high-vibration indication for the right engine, the report said. The crew followed the checklist, and the…