Bahraini forces have attacked anti-regime protesters in the northeastern island of Sitra and the northern village of Karanah, using tear gas and rubber bullets to break up the rallies.
The protesters had staged the demonstrations on Monday to demand the downfall of the Al Khalifa regime and the immediate release of all political prisoners from jails.
According to activists, at least 30 protesters have been arrested in Sitra and Karanah over the past week.
Anti-regime protests in Bahrain continue despite the heavy-handed crackdown by the Western-backed monarchy.
Scores of people have been killed and many others injured or arrested in the campaign of suppression.
Since mid-February 2011, thousands of anti-government protesters have been staging regular demonstrations in the streets of Bahrain, calling for the Al Khalifa royal family to relinquish power.
The anti-regime demonstrators hold King Hamad bin Isa Al Khalifa responsible for the deaths of the protesters during the popular uprising.