India's Prime Minister Narendra Modi has appealed for calm as violent protests against a new law on illegal migrants entered a fifth day.

Large demonstrations are taking place in the capital Delhi, Mumbai, Hyderabad and Kolkata (formerly Calcutta).

Monday's protests came a day after clashes between police and protesters in Delhi left at least 50 injured.

Protesters are angry at a law entitling citizenship to some non-Muslim migrants from three Muslim-majority countries.

But people are divided on why they have taken to the streets. Some critics say the law is anti-Muslim, while others - especially in border regions - fear large-scale migration.

The protests - which have left six people dead - began in the north-eastern state of Assam on Thursday, before spreading to other parts of northern and eastern India.

But as students resumed their protests on Monday, Mr Modi attempted to calm tensions in a series of tweets.

"No Indian has anything to worry regarding this act. This act is only for those who have faced years of persecution outside and have no other place to go except India," the prime minister wrote.

"This is the time to maintain peace, unity and brotherhood."

Authorities have tried to curb the protests by shutting down internet services, so it is unclear how many people in affected areas have seen his tweets.

Several lawyers have asked the Supreme Court to intervene, pointing out that officers had allegedly assaulted students in bathrooms, but the chief justice said that the court would not take any action until the protests ceased.

Delhi police spokesman MS Randhawa denied the allegations, saying his officers "exercised maximum restraint".

The UK, US and Canada have issued travel warnings for people visiting India's north-east, telling their citizens to "exercise caution" if travelling to the region.

What is happening in Delhi?

Protests resumed at the city's prestigious Jamia Millia Islamia university on Monday morning, despite violent clashes on Sunday which resulted in 35 students being detained.

A march on Sunday ended with at least three buses and several motorbikes being torched, roads blocked and stones being thrown at officers, who responded with tear gas.

The university said police later entered the campus without permission and video footage showed police assaulting students and staff. Videos shot by students show police beating up students inside campus areas like bathrooms and the library.

Police have said that they did what was "necessary" to stop the protests.

 

 

Student protesters near Jamia Millia Islamia in Delhi

The university's vice chancellor, Najma Akhtar, condemned the police action on Monday, telling reporters they would be filing a court case against the police and demanding a high-level inquiry.

She also denied rumours of student deaths.

Hundreds of people also protested in other parts of the city, including in Jawaharlal Nehru University and outside the city's police headquarters.

How have Indian authorities reacted?

India's Chief Justice Sharad Bobde said that the Supreme Court will intervene only if "the atmosphere settles down", adding that student protesters could not "take the law into their own hands".

"The court can't do anything right now. Let the riots stop," he said.

Meanwhile, Delhi police spokesman MS Randhawa appealed for calm and asked students to not get provoked, even as he denied allegations of excessive force.

"Police exercised utmost restraint. There was no firing and we have used minimum force," he said at a press conference on Monday.

 

 

Buses were torched in Delhi on Sunday

The police have been heavily criticised, with many on social media alleging that officers attacked students with sticks and tear gas when they were peacefully protesting.

But Mr Randhawa said students and locals threw stones at the police first, adding that 30 policemen were injured.

"We will identify outside protesters and take action against them," he said.

What has the reaction been in other Indian cities?

Live footage from the northern city of Lucknow on Monday showed students at Nadwa university throwing stones at security forces, who retaliated by throwing the stones back at them.

The students have been locked inside the campus.

A map of the unrest in the capital Delhi on Sunday

Local television footage also showed officers hitting students with large sticks.

In Kolkata, tens of thousands of people have joined a demonstration led by Chief Minister Mamata Banerjee and her ruling Trinamool Congress party.

The situation remains tense and more protests are expected. Students at the prestigious Indian Institute of Technology in the southern city of Chennai (formerly Madras) have already announced a protest this afternoon.

Why is the law so divisive?

The law allows non-Muslims from Bangladesh, Pakistan and Afghanistan, who entered India illegally, to become citizens.

The Hindu-nationalist BJP government argues that the law aims to accommodate those who have fled religious persecution.

Critics say the law is part of the government's agenda to marginalise Muslims, and that it violates secular principles enshrined in the constitution.

Earlier this week, the United Nations Human Rights office voiced concern that the new law was fundamentally discriminatory in nature.

The government denies any religious bias and says Muslims are not covered by the new law because they are not religious minorities, and therefore do not need India's protection.

Meanwhile, people in Assam fear that they will be "overrun" by illegal non-Muslim migrants from neighbouring Bangladesh.

They argue that outsiders will take over their land and jobs - eventually dominating their culture and identity.