US intelligence officials knew about mass killings of Jews in Nazi Germany but failed to acknowledge Hitler's evil campaign for a full six months, according to newly declassified documents. Within months of America entering the war, intelligence staff learned of plans for the Holocaust, but the information was given low priority by government officials. The documents also told of a previously unknown tea party hosted by Adolf Hitler on July 20, 1944, for Italian dictator Benito Mussolini. A translator present at the gathering said Hitler swallowed coloured tablets and went into a "fit of frenzy", questioning whether "the German people...