A Turkish passenger plane made an emergency landing in Istanbul on Friday after losing cabin pressure, authorities said. The MNG Airlines MD-82 was carrying 159 passengers from the southern Turkish resort of Antalya to Hamburg, Germany, when it suddenly lost cabin pressure, said Rasit Suerkan, a spokesman for Istanbul Ataturk Airport. It was not immediately clear why the plane lost cabin pressure. Nobody was seriously injured, but several passengers complained about ear aches and similar ailments, Suerkan said. Another plane was expected to take the passengers to Hamburg later in the day, he added. Turkish television channels quoted passengers as saying they heard a loud noise, and oxygen masks then dropped from the overhead compartments. The channels showed a doctor treating passengers at the airport in Istanbul. An MNG spokesman said he had no immediate information about the incident.