Police locked down New Delhi's key government district ahead of Monday's visit by Russian President Vladimir Putin, after two days of pitched street battles following the gang rape of a woman on a bus.

Putin is scheduled to meet with Indian prime minister Manmohan Singh Monday afternoon and later with the Indian president.

Authorities erected security barriers throughout the city's Raisina Hills area -- home to the presidential mansion, the parliament building and federal ministerial blocks. Only those authorized to work in the district were allowed to pass.

Furious weekend demonstrations rocked Raisina Hills as public outrage surged after a 23-year-old woman was sexually assaulted and beaten to near death on a bus on December 16 by a group of six suspects, now under arrest, police say.

Singh again expressed solidarity with the rape victim in a televised address on Monday. He also reiterated an earlier appeal for calm and a pledge of safety for women and children.

On Sunday, incensed protesters defied a police ban on demonstrations, clashing repeatedly with police.

As officers sprayed water cannons, some dispersed, while others huddled tightly in a circle to brave high-pressure streams in the cold December weather.

"We want justice!" the protesters shouted in chorus.

In addition to banners and cardboard placards, many demonstrators carried Indian flags as they scuffled with police. Authorities also fired tear gas to try to break up crowds.

Police spokesman Rajan Bhagat said "hooligans who had joined the protesters" hurled stones, injuring 78 officers on Sunday. At least 65 protesters were also injured, he said.

Many police vans and a dozen public buses were damaged during the demonstrations, he said.

Buy Sunday night, the scene was cleared of all protesters.

Earlier in the day, Singh called for calm after clashes escalated.

"We will make all possible efforts to ensure security and safety to all women in this country," the Indian leader said. "I appeal to all concerned citizens to maintain peace and calm."

In his statement, Singh acknowledged that the anger is "genuine and justified."

Authorities haven't released the name of the rape victim, but protesters are calling her "Damini," which means "lightning" in Hindi.

"Damini" is also a 1993 Bollywood film whose lead female character fights for a housemaid, a victim of a sexual assault.

"We support you Damini. We'll keep fighting for you," a middle-aged woman at the historic India Gate said Sunday. "Damini wants justice," read a placard at the protest.

The rape victim's injuries were so severe she spent days in intensive care in a city hospital, battling for her life. Police said Saturday that she had recovered enough to give a statement to a magistrate from her hospital bed the night before.

But on Sunday, she underwent another surgery to wash out infection in her abdomin, her doctors said.