The death toll in Delhi's worst religious violence in decades has risen to 24 as Indian police have been accused of looking the other way while Muslims and their properties were targeted.

A mosque was set on fire in the Indian capital on Tuesday by Hindu mobs, as several Muslim-populated areas in the city were attacked during three days of violence, which were triggered after attacks on sit-ins against a new citizenship law.

Muslims say the Citizenship Amendment Act (CAA) is part of Prime Minister Narendra Modi's Hindu supremacist agenda and is against the country's secular ethos.

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Indian website The Wire reported that a mob shouting "Jai Shri Ram", translated to "hail Lord Ram", paraded around the burning mosque in the Ashok Nagar area of the capital.

Video footage shared on social media showed a mob climbing to the top of the mosque's minaret where they attempted to plant a saffron flag, a banner associated with Hindu far-right groups.

The mosque was set on fire in the Indian capital on Tuesday by Hindu mobs [Sajjad Hussain/AFP]

Local media reported that shops in the area were also being targeted by the mob.

Police imposed a restriction on large gatherings in northeast Delhi as reports emerged of stone-throwing and more structures being set ablaze.

Horrific! Injured people are laying down on the ground and they are forced to sing the national anthem.



Security forces record them, beating them and shout "freedom". #DelhiBurning #DelhiViolence #India #DelhiIsBurning #DelhiPolice #TrumpIndiaVisit pic.twitter.com/qrUWTrrz0g — DOAM (@doamuslims) February 24, 2020

Anil Mittal, a senior police officer, said approximately 150 people were injured in the violence that started as US President Donald Trump arrived on a two-day India trip.

"Some of the people brought in had gunshot wounds," Rajesh Kalra, additional medical superintendent at the Guru Teg Bahadur Hospital, said of Monday's violence.

Renewed violence has been reported in Muslim populated areas such as Karawal Nagar, Maujpur, Bhajanpura, Vijay Park and Yamuna Vihar, while stones were thrown in neighbourhoods such as Maujpur.

Chief Minister of Delhi Arvind Kejriwal appealed to residents to maintain peace after an urgent meeting of his newly elected legislators in the capital.

'Severe shortage' of police officers

Kejriwal told ANI news agency that his party's legislators from the affected areas said there was a "severe shortage" of police officers.

The clashes erupted on Sunday after supporters of the Citizenship Amendment Act (CAA), passed by Parliament last December, attacked anti-government protest sites. The CAA, dubbed "anti-Muslim", has triggered nationwide protests, especially by Muslims.

Two of my colleagues @arvindgunasekar and @saurabhshukla_s were badly beaten by a mob just now in Delhi, they only stopped beating them after realising they are "our people- Hindus". Absolutely despicable. — Nidhi Razdan (@Nidhi) February 25, 2020

The violence started a day after the governing Bharatiya Janata Party (BJP) leader Kapil Mishra warned anti-CAA protesters to end their peaceful sit-ins in the northeastern Jafrabad and Maujpur areas of the Indian capital.

On Monday, police used tear gas and smoke grenades but struggled to disperse the stone-throwing crowds.

A tyre market was set on fire later on Monday, the Press Trust of India said. A video posted on social media showed crowds of men shouting "Jai Shri Ram" as they went on a rampage, according to AFP.

Several vehicles and a fire truck were torched in Jafrabad and Maujpur as police imposed prohibitory orders to prevent further violence.

A man is beaten during a clash between people supporting a new citizenship law and those opposing the law in New Delhi [Danish Siddiqui/Reuters]

'A dditional police officers deployed '

Mittal, the Delhi Police official, said on Tuesday additional police officers had been deployed in the northeast district of Delhi.

One police constable was among those killed in the violence that erupted just ahead of Trump's maiden visit to the capital city.

Trump and Indian Prime Minister Narendra Modi held talks on Tuesday at a venue located a few miles away from where the clashes occurred.

Delhi CM Arvind Kejriwal: MLAs of the affected areas informed me that there is a severe shortage of police force and police can't take action till they receive orders from the top. I have also asked District Magistrates to take out peace march with police in these areas. https://t.co/K9UcxvCSYR — ANI (@ANI) February 25, 2020

Tension in parts of the city remained high on Tuesday with schools remaining shut in some areas amid news reports of fresh clashes. At least five metro stations in the city were closed.

Several journalists covering the violence were also attacked by angry mobs at several locations.

"Two of my colleagues Arvind Gunasekar and Saurabh Shukla were badly beaten by a mob just now in Delhi, they only stopped beating them after realising they are 'our people - Hindus'. Absolutely despicable," senior journalist Nidhi Razdan wrote on twitter.

Monday's clashes were among the worst seen in Delhi since the protests against the CAA began in early December.

India's capital has been a hotbed of protests against the law, which eases the path of non-Muslims from three neighbouring Muslim-majority countries to gain Indian citizenship.

This has led to accusations that Modi and his Hindu nationalist BJP are undermining India's secular ethos.

The BJP denies any bias against India's more than 180 million-strong Muslim minority but objectors have been holding protests and camping out in parts of New Delhi for two months.

Bilal Kuchay contributed to this report from New Delhi