Croatia-bound plane lost cabin pressure and made an emergency landing in Frankfurt on Friday leaving some passengers bleeding from their ears. Thirty-three Ryanair passengers were treated in hospital, German police said Saturday. Oxygen masks were released on the Ryanair flight FR7312 from Dublin to Zadar in Croatia, which lost cabin pressure and diverted to Frankfurt Hahn airport, the airline said in a statement as reported by Reuters. "The passengers complained of headaches and earaches and felt sick," a police spokesman told the Germany news agency DPA. In a statement quoted by DPA, the low-cost Irish carrier said the aircraft had suffered a sudden loss of cabin pressure, prompting the deployment of oxygen masks with the plane going into a controlled descent to Frankfurt-Hahn airport. Ryanair said it had agreed to pay for hotels for the affected passengers but said there was a "shortage of available accommodation." According to AFP, the passengers were due to continue their journey to Croatia aboard a second Ryanair plane, they said.