The Nigerian authorities have dropped treason and other charges against dozens of protesters, including more than 30 children, who were arrested in August after taking part in anti-government demonstrations.

President Bola Tinubu had already called for the release of all the minors - some as young as 14 - after footage of four of them collapsing in court on Friday, apparently due to malnourishment, sparked outrage.

He also said the police and other officials involved in the arrests and subsequent legal processes should be investigated.