A powerful 7.8-magnitude earthquake has shocked wide parts of Turkey and Syria early Monday, destroying thousands of buildings and killing more than 2,700 people, with hundreds more believed to be trapped under the rubble. The epicenter of the pre-dawn earthquake was near Gaziantep, close to the Turkish-Syrian border. It was followed by a separate magnitude 7.5 earthquake about 100 kilometers north of the first one in the early afternoon.