The head of one of Greece’s leading environmental and cultural organizations was arrested yesterday on suspicion of possessing undeclared antiquities at his home in Plaka, central Athens. Costas Karras, the president of the Hellenic Society for the Protection of the Environment and Cultural Heritage, was taken into custody after police raided the property and found 24 marble artifacts, nine silver and bronze coins, four icons and four religious books from the 17th and 18th centuries. Archaeologists are examining the seized items. Police said that the items had not been registered with the Culture Ministry, as Greek law dictates. The 70-year-old suspect told police that some of the antiquities were family heirlooms, while others had been discovered on his land in Plaka. Karras is due to appear before a magistrate today.