On Sunday the ministry of public security said police had launched a year-long crackdown on terrorism.

The ministry of public security and police in Beijing, where many were seized, did not respond to queries.

The Shenzhen ministry of public security and the detention center where the workers are being held did not respond to faxed requests for comment.

Lopez Obrador repeated pledges to create a "national guard" and revive the ministry of public security which the PRI scrapped in 2012.

China's Ministry of Public Security did not respond immediately to requests for comment.

China's Ministry of Public Security did not immediately respond to a request for comment.

China's Ministry of Public Security did not immediately respond to faxed questions asking for comment.

The latest actions were announced in a statement published on the Ministry of Public Security website.

The Ministry of Public Security and Beijing's city police did not respond to faxed requests for comment.

Police rescued several villagers who were caught in the surge downstream, the Ministry of Public Security reported.

According to Vietnam's Ministry of Public Security, 60 percent of all traffickers arrested are former victims, Vu said.

Reuters' calls to the Ministry of Public Security in Beijing seeking comment on the situation were not answered.

The Ministry of Public Security said the operation broke up two trafficking rings and the leaders were arrested.

The Ministry of Public Security, which hosted the Beijing fair, did not respond to a request for comment.

The company will deliver the initial Digital Mobile Radio system for the Vietnam Ministry of Public Security's traffic police.

There was no immediate response from China's Ministry of Public Security to a faxed request from Reuters seeking comment.