FILE - In this July 10, 2009, file photo, Uighur men pray on their own in a mosque despite city wide closure of the mosques, in Urumqi, western China's Xinjiang province. Arrests made and details revealed about the Aug. 17, 2015, Bangkok bombing that killed 20 people have raised the question of whether members of an ethnic and religious minority from China’s far west were involved. (AP Photo/Eugene Hoshiko, File)