A US-based human rights group has urged the Indian government to launch a fresh investigation into the 1984 anti-Sikh riots which broke out following the assassination of then Prime Minister Indira Gandhi. Seven government-appointed commissions investigated the riots but all were either "whitewashes" or met with "official stonewalling and obstruction," the Human Rights Watch alleged. The report of the latest commission, the Justice Nanavati Commission, was due on November 1, but has been delayed for another two months, it said. "The time for commissions that do not lead to prosecutions is over," said Brad Adams, Asia Director of Human Rights Watch. "After two decades, the prosecutors and police should act. There is more than enough evidence to do so now," he said in a report. "The fact that many of the alleged planners of the violence were or are members of the Congress party should not be a barrier to justice for the victims." "Both the judiciary and administrative inquiry commissions have failed to hold these perpetrators accountable," Adams alleged and urged the current Congress-led government to launch a fresh probe on the 20th anniversary of the riots. "