sentences:  Ma Bufang and his only son Ma Jiyuan ( ) fled to Chongqing by air, and Xining fell to the PLA on September 5, 1949.The remaining 2,000 survivors of Ma Bufang's troops surrendered to the PLA after they fled to Huangzhong and Haiyan regions, and the entire Qinghai province fell to the PLA by the mid of September, 1949.Beiping Radio announced the capture of Lanzhou on August 27, 1949.