Hundreds of residents and tourists on the eastern Greek island of Kos have spent the night sleeping outdoors in parks, olive groves or in their cars, a night after a powerful earthquake killed two tourists and injured nearly 500 others across the Aegean Sea region, in Greece and Turkey.

At least two of the injured in Greece are listed in critical condition Saturday and had been airlifted to a hospital on the southern island of Crete.

The U.S. Geological Survey measured the quake, which struck in the early hours of Friday, as being of magnitude 6.7, with Greek and Turkish estimates a fraction lower. Two men, one from Turkey and one from Sweden, were killed when a collapsing wall smashed into a popular a bar on Kos.