Sikh groups protest near parliament

Indian police stand guard near the Presidential Palace during a protest against former parliamentarian Sajjan Kumar in New Delhi, India, Monday, May 6, 2013. An Indian court acquitted the ruling Congress party leader on Tuesday, April 30, of charges he incited mobs to kill Sikhs during the country's 1984 anti Sikh riots. (AP Photo/Tsering Topgyal)

An Indian Sikh shouts at police who try to detain him during a protest outside the residence of ruling Congress party president Sonia Gandhi after an Indian court Tuesday acquitted Congress party leader of charges that he incited mobs to kill Sikhs during the country's 1984 anti Sikh riots in New Delhi, India, Thursday, May 2, 2013. Former parliamentarian Sajjan Kumar had faced a possible death sentence if he had been convicted of inciting a mob in the capital to kill a family of Sikhs in the violence that followed the assassination of Prime Minister Indira Gandhi by her Sikh bodyguards. More than 3,000 Sikhs were killed during the riots. (AP Photo/Tsering Topgyal)

Indian Sikhs shout slogans from inside a police bus as they are detained during a protest outside the residence of ruling Congress party president Sonia Gandhi after an Indian court Tuesday acquitted Congress party leader Sajjan Kumar of charges that he incited mobs to kill Sikhs during the country's 1984 anti Sikh riots in New Delhi, India, Thursday, May 2, 2013. Former parliamentarian Sajjan Kumar had faced a possible death sentence if he had been convicted of inciting a mob in the capital to kill a family of Sikhs in the violence that followed the assassination of Prime Minister Indira Gandhi by her Sikh bodyguards. More than 3,000 Sikhs were killed during the riots. (AP Photo/Tsering Topgyal)

Indian Sikhs shout slogans from inside a police bus as they are detained during a protest outside the residence of ruling Congress party president Sonia Gandhi after an Indian court Tuesday acquitted Congress party leader Sajjan Kumar of charges that he incited mobs to kill Sikhs during the country's 1984 anti Sikh riots in New Delhi, India, Thursday, May 2, 2013. Former parliamentarian Sajjan Kumar had faced a possible death sentence if he had been convicted of inciting a mob in the capital to kill a family of Sikhs in the violence that followed the assassination of Prime Minister Indira Gandhi by her Sikh bodyguards. More than 3,000 Sikhs were killed during the riots. (AP Photo/Tsering Topgyal)

Indian Sikhs shout slogans from inside a police bus as they are detained during a protest against former parliamentarian Sajjan Kumar near the Presidential Palace in New Delhi, India, Monday, May 6, 2013. An Indian court acquitted the ruling Congress party leader Kumar on Tuesday, April 30, of charges he incited mobs to kill Sikhs during the country's 1984 anti Sikh riots. The signboard on the bus reads 29 years have passed, when will the culprits of 1984 riots be punished answer Indian government . (AP Photo/Tsering Topgyal)

Indian Sikhs shout slogans from a police bus as they are detained during a protest against former parliamentarian Sajjan Kumar near the Presidential Palace in New Delhi, India, Monday, May 6, 2013. An Indian court acquitted ruling Congress party leader Kumar on Tuesday, April 30, of charges he incited mobs to kill Sikhs during the country's 1984 anti Sikh riots. The man at center bottom is not detained. (AP Photo/Tsering Topgyal)