Five people died after looters torched a garment factory near Chile's capital Santiago, bringing the death toll in violent protests to at least seven.

At least 62 worshippers have been killed and dozens injured after multiple explosions rocked a mosque in Afghanistan's Nangarhar province during Friday prayers, according to officials, a day after the United Nations said violence in the country had reached "unacceptable" levels.

Catalonia should hold a new vote on independence from Spain within two years, the head of the region's government has said, in a fresh challenge to Madrid following days of unrest by pro-separatist protesters.

Heavy fighting broke out in northern Mexico on Thursday after security forces detained a son of the jailed drug kingpin Joaquín "El Chapo" Guzmán.

Fighting raged for several hours after Ovidio Guzmán López was found during a routine patrol in the city of Culiacán.