Members of a U.S. special operations task force punched and abused prisoners in Iraq in front of Defense Intelligence Agency agents and then threatened the agents to try to keep them quiet, a document made public on Tuesday stated. A letter from the head of the DIA to a senior Pentagon intelligence official, which detailed previously unknown incidents of abuse by U.S. forces on prisoners in Iraq, said the agents also saw detainees with burn marks and bruises. It was written two months after photographs of U.S. soldiers abusing prisoners at Abu Ghraib jail near Baghdad became public, and five...