GENEVA, Oct 27 (Reuters) - A U.N. committee on racism voiced concern on Friday about a "sharp increase in racist hate speech and dehumanisation" directed at Palestinians by Israelis, including senior officials, since the Oct. 7 Hamas attacks. Israel's diplomatic mission in Geneva criticised the statement which it said "failed all the victims of the October 7 massacre and the victims of antisemitic attacks worldwide". Israel says some 1,400 people were killed and more than 220 taken hostage when Hamas gunmen carried out attacks in southern Israel, prompting weeks of Israeli strikes on Gaza. The health ministry in Hamas-ruled Gaza...