HONG KONG/MANILA (Reuters) - A super typhoon swirled past Hong Kong on Sunday, barreling towards the Chinese coast and gaining strength over the South China Sea after it wreaked havoc in the Philippines and killed at least 29 people. A damaged building is seen as Typhoon Mangkhut hits Philippines, in Laoag, Philippines September 15, 2018 in this still image obtained from a social media video.