Thousands of protesters marched through the streets of Bahrain's capital, Manama, to mark the one-year anniversary of pro-democracy uprisings.
Protesters gathered around Pearl Square, now commonly referred to as 'Freedom Square', the epicentre of last year's demonstrations, and vowed to fight on.
Riot police and security forces tried to curtail the protests using tear gas, after the government warned of a zero-tolerance approach to any such anti-government activity.
Over 60 people are believed to have died since the protests started and there have been numerous accounts of protesters being tortured by Bahraini security forces.
The spokesperson for the US State Department, Victoria Nuland, urged the Bahraini leaders to “exercise restraint and operate within the rule of law and international judicial standards”.