The Indian prime minister appeals for calm and vows to protect women as police struggle to contain protests following the gang rape of a student.

Indian riot police look on as they keep watch along a sealed-off road in Delhi (pic: Getty)

As authorities shut down roads in India's capital, Delhi, Manmohan Singh said he understood the public anger at the "monstrous crime" but added that "violence will serve no purpose".

"There is genuine and justified anger and anguish at this ghastly incident," he said in a televised address.

"I feel deeply sad at the turn of events leading to clashes between protesters and police forces. I assure you that we will make all possible efforts to ensure security and safety to all women in this country.

"As a father of three daughters myself, I feel as strongly as you. We will ensure justice is delivered," he added. His pleas for calm were echoed by the victim's father.

'She needs your support'

"Please pray for my daughter and do not resort to any violent activity. She needs your support and your prayers," the father, who cannot be named for legal reasons, told the Hindi-language News 24 network.

"My daughter is fighting for her life, but she is very strong and has a strong will to live."

Protests have been taking place across India over the last week to denounce the police and government over the gang-rape of the 23-year-old student in the capital and the surge of violence against women.

Official figures show that 228,650 of the total 256,329 violent crimes recorded last year were against women, with the number of rapes in the capital rising 17 per cent to 661 this year.

The biggest protests were in New Delhi on Saturday, prompting police to cordon off areas around government buildings.

However, fresh clashes erupted on Sunday and police said more than 100 people were injured including 60 policemen.

The clampdown was further tightened on Monday, with commuters having to make lengthy detours to get to work.

Thousands of armed police and paramilitary troops blocked roads in central New Delhi to prevent protesters from marching to the presidential palace.

A small group of demonstrators gathered at a venue less than a mile away from India's parliament to press the government to ensure the security of women in the city.

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