Police in Nepal have arrested former Prime Minister Khadga Prasad Oli over the deaths of dozens of people during violent protests in September that toppled the government and resulted in new elections.

Protests against Nepal’s short-lived ban on social media grew increasingly violent as demonstrators set government buildings and politicians’ homes on fire and attacked some leaders.

Flooding caused by continuous rainfall has killed at least 66 people in Nepal and a further 69 are missing.