An Islamic State suicide bomber killed at least 31 people including women and children and wounded dozens outside a voter registration center in the Afghan capital Kabul on Sunday in the latest attack on election preparations.

Authorities on Sunday evacuated Mont Saint Michel, one of France's busiest tourist sites, and were searching for a suspect whom witnesses said had threatened to attack local security forces.

At least 14 suspected Maoist guerillas were killed Sunday in a gunfight in India's western state of Maharashtra, police said, yet another violent clash in the country's longest-running conflict.

Armenia on Sunday detained anti-government protest leader Nikol Pashinyan, prosecutors said, shortly after Prime Minister Serzh Sarkisian stormed out of talks with him on the tenth day of mass rallies against his rule.

Iran has warned it is ready to "vigorously" resume nuclear enrichment if the United States ditches the 2015 nuclear deal, and said further "drastic measures" are being considered in response to a U.S. exit.

Armenia's political crisis deepened Saturday as protest leader Nikol Pashinyan said he was only prepared to discuss the exit of the country's newly elected prime minister, former president Serzh Sarkisian.

"We are only ready to discuss the conditions of his departure," news agencies quoted Pashinyan as saying after Sarkisian called on the opposition to enter into talks with authorities.

A reformist lawmaker in Iran criticised the Revolutionary Guards on Saturday for holding a group of environmentalists without access to lawyers or their families.

Armenia's newly elected prime minister and ex-president Serzh Sarkisian on Saturday sought a "political dialogue" with protest leader Nikol Pashinyan as mass rallies against his rule entered their ninth day.

Iran's President Hassan Rouhani said Saturday that officials were failing to respond effectively to mounting popular protests, in part because they are being threatened by unnamed behind-the-scenes forces.

Recent weeks have seen social media filled with videos and reports of protests, but since they are barely covered by domestic media and access is restricted for foreign journalists, they have been hard to verify.

Violent protests against a proposed change to Nicaragua's pension system have left at least 10 people dead over two days, the government said Friday.