There was never going to be a perfect time to release this report," President Barack Obama said earlier this month after the Senate Intelligence Committee unleashed its long-awaited "torture report." But in the wake of this rare moment of transparency, the administration took the next step in keeping additional evidence of prisoner abuse concealed. The government is withholding nearly 2,100 images that show the military's brutal treatment of detainees at various prisons in Iraq and Afghanistan. While the previously disclosed pictures from Abu Ghraib are the stuff of nightmares – piles of naked bodies, detainees being led on leashes and U.S. soldiers giving a thumbs-up as it all happens – these photographs are said to be even more disturbing. The American Civil Liberties Union (ACLU) originally sued for the images' release in 2004. Obama ... blocked the release, [and now] contends that the photographs could further encourage attacks against the U.S. personnel still in Afghanistan and Iraq and could be used by the recently galvanized Islamic State-the terrorist group commonly known as ISIS. Alex Abdo, an ACLU staff attorney working on the case since 2005, said ... that the government is essentially arguing that [the images must remain] secret because they powerfully document abuse. "If there's anything the debate over torture is missing, it's the sort of evidence that photographs give you-irrefutable evidence of the brutality of the mistreatment," Abdo said.