A report released Thursday by leaders of the Senate Armed Services committee said that top Bush administration officials, including Donald Rumsfeld, the former defense secretary, bear major responsibility for the abuses committed by American troops in interrogations at Abu Ghraib prison in Iraq, Guantanamo Bay, Cuba, and other military detention centers.

The report was issued jointly by Senator Carl Levin of Michigan, the Democratic chairman of the panel, and Senator John McCain of Arizona, the top Republican. The report represents the most thorough review by Congress to date of the origins of the abuse of prisoners in American military custody, and it explicitly rejects the Bush administration's contention that tough interrogation methods have helped keep the country and its troops safe.