Protests have been held in Delhi over the attack, which has caused outrage The Indian government has announced a series of measures to make the capital safer for women after Sunday night's gang rape of a 23-year-old student.Home Minister Sushil Kumar Shinde said there would be more police night patrols, and all bus drivers and their assistants would be subject to checks.
There has been outrage in India after the student and a male friend were attacked on a bus.
The woman remains in a critical condition, doctors say.
Four people, including the bus driver, have been arrested. Police say they are looking for two more people.
On Tuesday night, the chief of the ruling Congress party, Sonia Gandhi, visited the hospital where the student is fighting for her life.
Ms Gandhi later said that the "strictest possible measures" should be taken to prevent such incidents.
Mr Shinde was forced by angry MPs in the Rajya Sabha, the upper house of parliament, to make a statement for the second time in as many days on Wednesday morning.
"Private buses, when not in use, must be parked with their owners and the photo identification of the driver and staff of every bus would have to be displayed, and the police would enforce this," he said.
The bus which was used for Sunday night's crime had dark tinted glass. Mr Shinde said "buses with dark windows and curtains would be impounded".
Earlier in the day, Mr Shinde held a meeting with the top officials of the Delhi police.
Protests continueMeanwhile, protests have continued for the second day in Delhi, with many accusing the government of not doing enough to stop crimes against women.
Women MPs from the opposition Bharatiya Janata Party (BJP) held a demonstration outside parliament while hundreds of activists and students shouted slogans outside the Delhi police headquarters.
Police used water canons to disperse a large group of protesters outside Chief Minister Sheila Dikshit's home.
The police were also criticised by the Delhi High Court, which asked them to give a report on the incident in two days.
"How did the bus cross five police check points without anybody stopping it?" the judges asked. "Those responsible have to be punished," they warned.
The incident has caused outrage across the country and lawmakers from all parties have expressed their horror.
Angry MPs have demanded the death penalty for the rapists, and protests and candlelight vigils have been held in the capital.
The woman and her friend boarded the bus in Munirka area and were on their way to Dwarka in south-west Delhi.
They were returning after watching a film in a shopping centre in south Delhi, police said.
