Humanitarian groups said on Thursday they had run out of words to describe the horrors unfolding in Gaza, stressing that states and especially Israel could not “offload” responsibility for the carnage onto aid workers. There have been growing international warnings after Israel vowed to push ahead with a major operation in southern Gaza’s Rafah, where 1.5 million Palestinians remain trapped. Humanitarians have warned that carrying out aid operations in the area could soon be impossible. “We are reaching the barriers of language in describing the humanitarian situation,” ICRC president Mirjana …