Three US senators, including the chair of the Senate Intelligence Committee, have stepped up pressure on the CIA over its response to Zero Dark Thirty, a new film about the hunt for Osama bin Laden.
In a letter sent to the CIA and released on Thursday, Dianne Feinstein, the head of the Intelligence Committee, Armed Services Committee chairman Carl Levin and Senator John McCain asked the agency for evidence that "enhanced interrogation techniques" produced information that helped US authorities locate and kill the al Qaeda leader in May 2011.
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