Twenty-three people have been killed so far in the deadliest violence the Indian capital has seen in decades.

The clashes first broke out on Sunday between protesters for and against a controversial citizenship law.

But they have since taken on communal overtones, with reports of people being attacked based on their religion.

Photographs, videos and accounts on social media paint a chilling image of the last few days - of mobs beating unarmed men, including journalists; of groups of men with sticks, iron rods and stones wandering the streets; and of Hindus and Muslims facing off.

The Delhi High Court, which is hearing petitions about the violence, has said it cannot let "another 1984" happen on its "watch". In 1984, more than 3,000 Sikhs were killed in anti-Sikh riots in the city.