>> those attacks really shook xi jinping. >> xi jinping is vowing to catch and severely punish those responsible. >> the attackers are uyghurs, a largely muslim ethnic group with its own language and culture. for xi jinping, the uyghurs become public enemy number one. he launches an unprecedented mass surveillance of their population. in china's xinjiang region, building refugee camps that locked up over a million people and ripped loved ones away from their families. former camp prisoners say uyghurs have been tortured, forced into having abortions,