A major earthquake struck Turkey and Syria on Monday, killing more than 3,000 people and flattening thousands of buildings as rescuers dug with bare hands for survivors.Dozens of nations have pledged aid since the 7.8-magnitude quake, which hit as people were still sleeping and amid freezing weather that has hampered emergency efforts.Multi-storey apartment buildings full of residents were among the 5,606 structures reduced to rubble in Turkey, while Syria announced dozens of collapses, as well as damage to archaeological sites in Aleppo.