This article states that the injured passengers were injured by falling hand luggage from OHCs. Perhaps that is why most airlines restrict hand luggage to 5 kg, rather than 10kg allowed by FR.
Two passengers and a steward received medical treatment for slight head injuries at a Bologna hospital last night, after they were injured in turbulence that led a Treviso bound Ryanair flight to make an emergency landing at Bologna's Marconi airport.
The incident happened at 20.20 yesterday evening, when the flight that departed from Malta was reportedly caught up in severe turbulence while descending on the Tyrrenian Sea, There were 170 people on board the flight, 40 of which were Maltese.
According to the Bologna airport authorities, the plane struck two air-pockets causing the aircraft to buckle.
Some passengers were slightly injured by falling baggage from the over-head compartments.
After a two-hour wait at Bologna, all passengers were transferred to Bologna on another flight.
Ryanair Malta-Treviso flight makes emergency landing at Bologna airport | MaltaToday