A statement on the website of Nghe An provincial police said 34-year-old Hoang Duc Binh was taken into custody yesterday.
He was accused of instigating local Catholics to attack officers on duty and gather at a local government office, causing public disorder.
The provincial government issued a statement that accused Catholic priest Nguyen Dinh Thuc of instigating Catholics to block Highway 1 to demand Binh's release.
International human rights groups and some Western governments have often accused Vietnam of jailing people for peacefully expressing their views, but Hanoi maintains that only lawbreakers are put behind bars.
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