The strike on the Shajareh Tayyebeh School killed more than 175 children and teachers. GENEVA, March 27 (Reuters) - The U.N. rights chief urged Washington to conclude its investigation into a fatal strike on a primary school in Iran at a U.N. Human Rights Council meeting on Friday, with some states voicing outrage over the incident. The emergency debate at the Geneva council was called by Iran to discuss the attack on the Shajareh Tayyebeh School which Tehran says killed more than 175 children