A government statement said on March 22 that Bui Hieu Vo, 55, and Phan Kim Khanh, 24, had posted "fabricated, distorted and defamed information" on their Facebook pages, blogs and YouTube channels, with the help of the U.S.-based Viet Tan - an organization Hanoi has declared a terrorist group.

The statement added that Bui Hieu Vo had also encouraged people to attack Party leaders and police using petrol and acid bombs. 

Both bloggers admitted to their crimes and their links to the anti-state group, the statement said.

Last week, Vietnam called on local companies to stop advertising on YouTube, Facebook and other social media after they were accused of publishing "toxic" anti-government content.