Riot police in Bahrain used teargas and stun grenades to break up an anti-government demonstration in the capital, Manama on Friday.
The protests were called by the opposition, which on Sunday accepted a government invitation to join a new round of national dialogue talks, which it had previously rejected.
The BBC reports that opposition parties appear to be losing control of the protests, as a youth movement, called February 14, becomes increasingly influential.
On 14 February 2011, peaceful protesters took over the Pearl Roundabout monument. Security forces cleared the site using tear gas, batons and birdshot three days later.
At least two protesters died and hundreds were injured.