CAIRO (AP) — U.N. human rights experts urged Egypt on Thursday to halt the execution of six men, sentenced to death over killing a policeman, saying that their trials were "flawed" and "did not meet international standards of fairness." The U.N statement comes after Egypt's top appeals court upheld the death sentences against the men, charged with killing the guard of a judge who was on a panel of judges in the trial of former Islamist President Mohamed Morsi, in which he was sentenced to 20 years on charges of killing protesters during his reign.