The US National Transportation Safety Board said Thursday it will lead the investigation into an incident in which a passenger was partly sucked out of a Ryanair Boeing 737’s broken window over Greece last week.

Both Greek prosecutors and air accident investigators have launched investigations into how the window became dislodged.

Svetlana Maksimovic and her husband Ljubisa Karovic had just settled into a Ryanair flight last week when a loud bang pierced the hum of engines.