Twelve people believed missing on the Euroferry Olympia, a car ferry ablaze in the southern Adriatic near the Greek island of Corfu, have still not been found, Greek state radio reported on Saturday. The operation to rescue the passengers shown on the official list but not yet found aboard the Italian vessel is being hampered, or even made impossible, by the extreme temperatures on the ferry’s deck. Corfu prosecutors initiated an investigation on Saturday. The Euroferry Olympia’s captain and officers are on the island and will be questioned, according to the radio reports. No arrests have been…