Riot police in the Armenian capital early used water cannon to disperse several hundred demonstrators protesting a government hike in electricity prices.
Campaigners protesting China's annual dog meat festival were forcibly dispersed by unidentified men as they attempted to rally outside a government office.
Burundi's opposition late Friday slammed the election commission for steering the country towards a controversial presidential vote next month.
A member of punk protest group Pussy Riot and a fellow activist were arrested at a demonstration in Moscow demanding better conditions for women held in Russian prisons.
At least 10 people were injured and 25 arrested in Kiev as scuffles broke out between members of a rare Ukrainian gay pride march and their nationalist foes.
Germany's anti-Islam PEGIDA movement has its sights set on gaining a political foothold when its eastern stronghold city of Dresden goes to the polls.
More than 30,000 people kicked off protests against a G7 summit starting at the weekend in the southern German state of Bavaria.
Several hundred protesters gathered in Brasilia to demand the impeachment of President Dilma Rousseff after they completed a 1,000-kilometer (650-mile) march on the capital.
Polls opened in Ireland for a historic referendum on allowing same-sex marriage that is backed by all the main political parties but opposed by the Catholic Church.
Prince announced a peace concert in Baltimore on Mother's Day after the death in police custody of an African American man sparked sometimes violent protests.
Baltimore lifted a curfew that was imposed across the US East Coast city following widespread riots, as thousands of National Guard troops began to pull out.
More than two dozen protesters including a leading human rights activist and opposition politicians were detained overnight in Malaysia.
Several hundred people protested in New York demanding police reform and justice for the African-American man who died from injuries sustained in custody in Baltimore.
Bare-chested Femen activists making Nazi salutes disrupted a speech by France's far-right leader Marine Le Pen at her National Front party's traditional May 1 rally in Paris.
A Hong Kong pro-democracy protester apparently assaulted by police -- in a beating captured on video.
Hundreds of thousands of Brazilians took to the streets, venting anger over government corruption and economic drift a month after larger protests gathered.
Protesters waving Australian flags and carrying signs such as "Yes Australia. No Sharia" rallied around the country.
Thousands marched in Mexico City to mark six months since the disappearance of 43 college students.
Thousands of Salvadorans marched in memory of slain archbishop Oscar Romero, who was assassinated 35 years ago during the country's civil war.
Brazilian President Dilma Rousseff pledged to hold talks with her growing number of critics and said her embattled government needed to show humility.