India, Sept. 26 -- Rescuers combing through the rubble of a building that collapsed in a blast in the Greek capital's tourist district of Plaka, near the ancient Acropolis, recovered two unconscious people and searched for four others, authorities said Saturday.

The blast on Friday morning was believed to have been caused by a massive gas leak, Athens Mayor Haris Doukas said on Friday night. He said that neighbouring buildings were also damaged and were evacuated.

The fire department said that a second person was found unconscious in the rubble of the two-storey house in Plaka, the historic part of Athens that lies at the foot of the Acropolis hill, Greece's most visited ancient monument.

Earlier Saturday, an unconscious woman was take...