Upon further investigations by the airline, it was found one of the cabin crew used the international code for hijacking over the interphone to the flight deck. The crew member states she got a reply, however the flight deck crew never heard the message, and found out much later that an attempted hijacking had occurred and crew were injured. The flight deck crew also stated they both heard yelling and screaming coming from the passenger cabin, and that they attempted to call the cabin crew but they received no answer and decided at this point to declare a pan-pan call to air traffic control (a pan-pan call is one call below the urgency of a Mayday).