Ai stated on 3 November 2010 the higher authorities had let him know him two months earlier that the newly completed studio would be knocked down because it was illegal and did not meet the needs. Ai criticized that this was biased, and he stated "the only one singled out to have my studio destroyed". As reported by "The Guardian" Ai saying Shanghai municipal authorities were "upset " by documentaries on objects they considered delicate: two of the higher known ones featured Shanghai resident Feng Zhenghu, who lived in forced separation for three months in Narita Airport, Tokyo; another well-known documentary focused on Yang Jia, who murdered six Shanghai police officers.