Two earthquakes with preliminary magnitudes of 5.1 struck near Greek islands in the Aegean Sea but there were no reports of damage or injuries, authorities has said. The Athens Geodynamic Institute said the first quake occurred off the holiday island of Kos in the eastern Aegean at 11:11 am (local time), followed by the second near the island of Alonissos, in the central Aegean at 9:53 pm (Local time). Earthquakes are common in Greece and neighbouring Turkey.