With China accused of detaining hundreds of thousands of Uighur Muslims without trial in its western province of Xinjiang, a BBC investigation analyzed satellite data to determine that the detention camp system in the region is rapidly expanding. Reviewing images from the European Space Agency's Sentinel satellite service, the BBC finds at least 40 such facilities across Xinjiang, half built within last two years—with a big thrust of construction just in the past six months. Among the largest is a "massive, highly secure compound" still being built at Dabancheng, about an hour's drive from the provincial capital, Urumqi. It is enclosed within a two kilometer-long exterior wall punctuated by 16 guard towers. (Photo via UNPO)