A swimming pool shakes violently causing waves inside a resort in General Santos City, the Philippines during a strong earthquake on December 15. <br /><br />Guests were having their office Christmas party when they felt the 6.8-magnitude earthquake. <br /><br />It has killed at least seven people, including those trapped inside a collapsed supermarket in Padada town. <br /><br />This has been the strongest in the series of powerful quakes felt in the Mindanao region in the last two months. <br /><br />The United States Geological Survey (USGS) said the quake hit South Cotabato at 2:11pm local time. Officials confirmed there were a number of aftershocks across the region.
