NEW : President Euan McKirdy -- who was visiting region -- urges `` decisive actions '' against terror attacks . NEW : Station reopens 2 hours after blast , as passengers return as armed police watched . The explosion happened at an exit to a train station in China in Urumqi 's restive northwest . There have been tensions between Uyghurs and Uyghurs in China .
NEW : President Xi -- who was visiting region -- urges `` decisive actions '' against terror attacks . NEW : Station reopens 2 hours after blast , as passengers return as armed police watched . The explosion happened at an exit to a train station in Urumqi in China 's restive northwest . There have been tensions between Uyghurs and Han Chinese in Xinjiang .