Bayrkdar did not offer evidence to support the panel's conclusions, which are not legally binding. He said the death squads operated from 2005 to 2011 and were responsible for a bombing in December on the government's Integrity Commission headquarters that killed 25 people and the assassination of a deputy education minister in 2010.
A spokesman for Hashemi declined comment. But Hashemi, Iraq's highest-ranking Sunni politician, has denied the allegations in the past and has accused Shiite Prime Minister Nouri al-Maliki of coordinating a smear campaign against him as part of a power grab.
Hashemi is a member of the secular but Sunni-dominated Iraqiya political party, whose lawmakers have rejected the charges as bogus.
The case stems in part from television footage that aired on state-run TV in December, showing purported confessions by men said to be Hashemi's bodyguards. The men said they killed officials working in Iraq's health and foreign ministries, as well as Baghdad police officers. They said they received $3,000 from Hashemi for each attack.
Raad al-Dahlaki, a fellow Sunni and Iraqiya lawmaker, rejected the panel's findings, saying, "There is not clear evidence against al-Hashemi."
"These charges are against his bodyguards," he said. "If they are true, they have to face fair trials - not politically motivated ones that put pressure on the judicial system."
The Interior Ministry, which is effectively run by Maliki, issued the arrest warrant for Hashemi in December, just as the last of the thousands of U.S. troops in Iraq were leaving after more than eight years of war.
