The Greek army said late on Saturday that it was ordering an investigation into how a Turkish flag was defaced and left in the room of Turkish officers who were visiting Greece last week, while the Greek and Turkish foreign ministers were trying to establish closer ties between the two armed forces. In a statement, the army general staff called the incident, during which slogans were written on the flag, «regrettable» and pledged to track down the perpetrators and punish them severely. The statement came as the Turkish Foreign Ministry and army demanded an apology for the incident, which they said occurred last Tuesday. The two visiting officers and five cadets, who had been invited to the Army Academy in Athens as part of a goodwill gesture, were ordered to return home on Wednesday. As part of his fraught visit to Turkey last week, Foreign Minister Petros Molyviatis agreed to a series of confidence-boosting measures with his Turkish counterpart, Abdullah Gul, such as setting up a hotline between air force command centers and Greek lessons for Turkish officers and vice versa.