Several protests took off from Shiite villages on the outskirts of Manama, with youth trying to reach the capital’s former Pearl Square, where democracy demonstrators camped for a month last year before being forcefully driven out.
Protesters marched from Sanabis, Deih and Jidhafs, which lie few miles west of Manama, despite police warning that protests would be dispersed, witnesses said.
"Down with (King) Hamad!" they chanted.
The Coalition of the Youth of February 14th Revolution, a hardline group that operates separate from the political opposition led by Al-Wefaq, declared on Tuesday the day to return to the square that was razed after the mid-March crackdown.
"All of us are returning" to the square, read a call for protest posted on its Facebook page, designating 6:40am (0340 GMT) as the starting time.