The launch of a Long March 3B carrying BeiDou-3 M7 and M8 on January 11th was a success. An alert was, as usual, issued 48 hours before the launch to the residents living on the flight path to prevent any victim due to the fall of the YF-25 boosters. However, some villagers were able to attend the event, and one of them was able to film the fall of one of the boosters as well as its impact and detonation, forming a large toxic cloud.
Original source: https://weibo.com/tv/v/FDZAzteEQ?fid=1034:1f7e0a18988adfe958f3b4e2ce04b641
The video also is available to look at on Spaceflight101: http://spaceflight101.com/chinese-villagers-capture-falling-long-march-rocket-booster-on-video/
Unfortunately, these villagers were not warned of the danger of the hypergolic propellants residues.