An Iraqi migrant, living in Greece legally, died of a heart attack yesterday morning in central Athens while in police custody after he and 12 other immigrants were forced to leave an old house in which they had been squatting. Aziz Madat Karo, 44, collapsed at the police station in Exarchia shortly after 10 a.m. A doctor who was called to the scene was unable to revive the man and pronounced him dead as a result of heart failure. Officers said that some of the other migrants he had been living with told them that Karo had a history of heart problems. Karo had been living in an old house in Exarchia with 11 other Iraqis and an Iranian. Police went there yesterday morning to ask the men to leave the premises. A civil engineer employed to renovate the building had notified the officers. The migrants were escorted to the nearby police station and were waiting to have their details checked when Karo suffered a heart attack.