Nine European nationals have been arrested in Iran during deadly street protests sparked by a custody death.

Intelligence officers detained people deemed to be "agents of foreign spy organisations" either at protests or "behind the scenes", local media said.

The violence shows no sign of easing, with the death toll continuing to rise.

Protests erupted in the capital Tehran and spread through the country after Kurdish woman Mahsa Amini died having spent time in police custody.

The 22-year-old, from the north-western city of Saqez, was arrested in Tehran on 13 September by morality police officers for allegedly violating the strict law requiring women to cover their hair with a hijab, or headscarf.

Officers did not specify where the nine Europeans had been arrested, but gave 10 instances of what it said was involvement by foreigners and foreign-based opposition groups in the demonstrations.

Those detained are from Poland, Sweden, Germany, Italy, France and the Netherlands, Iran's intelligence ministry says.

The German, French, British and Swedish embassies were among those who were warned over the involvement of their "agents" in the anti-government protests, the ministry added.

It also claimed that before and during the protests, several other plots had taken place to either prepare for or coincide with the unrest, including cyber-attacks and the spread of "fake, pro-riot news" by non-state media such as BBC Persian and Iran International.