Vo Thanh Tung, 31, who works for Ho Chi Minh City's Law newspaper, was detained yesterday after allegedly being caught receiving cash from a bar owner in southern Bien Hoa city, the Tuoi Tre newspaper said.
Police detained Tung -- who is well-known for his investigative work, most recently on the entertainment industry -- and searched his house, confiscating "a baton, a taser, handcuffs, computers, cameras and documents," the report said.
Two of Tung's stringers, who had worked on his investigative reports, were also arrested, it added.
The Ho Chi Minh City's Law newspaper confirmed its reporter had been held in a brief news item, but did not give further details.
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Communist Vietnam bans private media and all newspapers and television channels are state-run.
Some journalists working at state-run media have become increasingly tenacious in their reporting in recent years, but face constant pressure from authorities and often risk prosecution if they push too hard.
In 2008, a reporter was jailed for two years after exposing corruption in the country's transport ministry.
The high-profile prosecution sent a chill through the country's ranks of journalists and prompted condemnation from international media watchdogs.
Vietnam, branded an "enemy of the Internet" by Reporters Without Borders, ranks among the worst countries in the world on press freedom.
Watchdogs say dozens of journalists and bloggers are currently being held in Vietnamese jails.
At least three bloggers were also taken into custody in June alone, all accused of anti-state activity.
The country has recently revealed a sweeping new Internet law which will ban bloggers and social media users from sharing news stories online, in a move seen as a further crackdown on online freedom in the authoritarian country.
The United States said it was "deeply concerned" about the decree.