WASHINGTON (AFP) – US Senate Republicans on Friday pulled out of a bipartisan investigation into controversial "war on terror" detentions and interrogations, including tactics widely condemned as torture. The move by the opposition party dealt a sharp blow to the Senate Intelligence Committee's efforts to find out exactly what methods were used when and whether they paid off -- without prosecuting witnesses or agents thought to have committed abuses. Senator Kit Bond, the panel's top Republican, blamed Attorney General Eric Holder's investigation into alleged CIA abuse of detainees, which he said made it impossible for current or former CIA officials...