(Reuters) – Vietnam has freed two more political dissidents, making it three activists released in the space of a week, as pressure increases on the communist government to stop jailing its critics. Nguyen Tien Trung, a 30-year-old blogger, was freed from a prison in southern Ho Chi Minh City on Saturday, his father said. Vi Duc Hoi, 56, a former communist party member who became a democracy activist, was released on Friday, London-based rights group Amnesty International confirmed on Monday. Trung's father, Nguyen Tu Tu said it was a positive move by the authorities and hoped more would follow.