Rescuers are scrambling to find survivors under the rubble of buildings in Albania, where a strong earthquake has killed 26 people and injured 650. The magnitude-6.4 tremor struck 34km (21 miles) north-west of the capital, Tirana, as people slept in their beds during the early hours of Tuesday. Most of the deaths occurred in the coastal city of Durres and the town of Thumane, close to the epicentre. Hundreds spent the night in tents, some slept in cars, as aftershocks continue. Some 500 shocks have been felt since the initial quake hit at 03:54 local time (02:54 GMT) on Tuesday. Search teams have arrived from a number of European countries to help find survivors. More than 40 people have been pulled from the rubble and Prime Minister Edi Rama promised that rescuers would "continue to search patiently and thoroughly to the end". The government has declared Wednesday a day of mourning. The European Commission said it had deployed rescue teams from Italy, Greece and Romania to help with the search efforts, while teams were also sent from Kosovo and Montenegro. Tuesday's earthquake is the strongest to hit Albania in decades.