HAMILTON, Canada  UN relief chief Tom Fletcher on Monday denounced the growing violence against aid workers, warning that the killing of aid staff in conflict zones such as Yemen and the Gaza Strip is becoming "normalized." "We're under attack. Last year, 380 plus aid workers killed, the highest ever. Two hundred and seventy already this year. It's a record that I fear will break again, and that violence against us -- and I'll come on to Yemen, for example, and of course the OPT (occupied