ABUJA (Reuters) - Four suspected members of a radical Islamist sect have been charged with orchestrating a suicide bombing on United Nations headquarters in the Nigerian capital last month that killed at least 23 people. They face the death penalty if found guilty. The men were among 19 brought to a magistrates court in Abuja on Friday accused of carrying out separate attacks as members of Boko Haram, an Islamist group blamed for almost daily shootings and bombings in the remote northeast. The group, whose name translates to "Western education is forbidden" in the local Hausa language spoken in northern Nigeria, has shown its menace with a bombing in the police headquarters car park in Abuja in June and the U.N.