The Chinese Ministry of Public Security (MPS) is continuing investigations which saw four people detained for suspected bribery in November.

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On Tuesday, China's Ministry of Public Security warned investors to be suspicious of phone calls, e-mails and websites touting supposedly highly profitable stocks.

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Li Zhuqun, a senior international co-operation official at China's Ministry of Public Security said the gang had now been broken up, but that "efforts to ensure the safety of the Mekong River will continue".

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These included: the Ministry of Culture, the State Economic and Trade Commission, the Ministry of Public Security, the Ministry of Industry and IT, the Ministry of Foreign Trade and Economic Cooperation, the General Administration of Customs and the State Administration for Industry and Commerce.

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Mexican Attorney General spokeswoman Rocio Torres denied her country's involvement with the drone Friday, but later in the day, another Mexican official said the drone was being operated by the Ministry of Public Security and was following a target at the time of the mechanical malfunction.

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China's public security ministry reportedly received word from China's embassy in Venezuela in 2011 of dozens of cases of robbery, kidnapping and extortion targeting Chinese citizens.

BBC: Kidnap ring suspect sent back to China from Venezuela