TIRANA/THUMANE, Nov 26 (Reuters) – At least seven people were killed when the most powerful earthquake to hit Albania in decades rocked the capital Tirana and surrounding region early on Tuesday, causing buildings to collapse and burying residents under rubble. Residents, some carrying babies, fled apartment buildings in the capital Tirana after the 6.4 magnitude quake struck shortly before 4 a.m. (0300 GMT).