The Wall Street Journal reported on April 15 that Beijing might secretly be conducting small nuclear tests at its Lop Nur site in Xinjiang. It said a new nuclear arms control report prepared by the US State Department depicts a satellite photo taken on March 29 of the Chinese nuclear test site at Lop Nur showing a cement truck near the tunnel entrance and piles of dirt on the spoil pile. It said the new arms control report, not yet released to the public, said 'China might be secretly conducting nuclear tests with very low explosive power despite Beijing’s assertions that it is strictly adhering to an international accord banning all nuclear tests'. The report cites an array of activities that “raise concerns” that Beijing might not be complying with the “zero-yield” nuclear-weapons testing ban. The report added that the concerns stem from the high tempo of activity at China’s Lop Nur test site, extensive excavations at the site, and Beijing’s purported use of special chambers to contain explosions.