Almost everything else about the case is speculation based on unidentified sources whose motives in recounting the case's details are unclear. The police have said nothing, and the absence of reliable information has left the field clear for a welter of dramatic rumors, spreading like wildfire on the Chinese equivalent of Twitter, ranging from the type of poison used to kill Heywood to an impending military coup.
The case began to crack open Feb. 7, when photographs appeared on Weibo (China's version of Twitter) showing an unusual congregation of police outside the US Consulate in Chengdu, 170 miles from Chongqing. Two days later, another blogger posted the passenger manifest of a flight from Chengdu to Beijing showing that Bo's right-hand man, Wang Lijun, had taken that flight in the company of a vice minister of security.
Mr. Wang, it transpired, had fled to the US consulate, apparently seeking asylum, but left of his own accord when he was sure that regional police loyal to Bo wouldn't take him into custody.
Wang was almost certainly not going to be given asylum by the United States. He had been the chief of police in Chongqing during Bo's noisy antimafia campaign, which critics and victims complained had relied heavily on torture. But before handing himself over to the Chinese security chief and disappearing into an interrogation room somewhere, Wang showed US diplomats a police file suggesting that Ms. Gu had been involved in Heywood's murder.