A Queens elementary school teacher arrested on Thursday and accused of repeatedly sexually abusing two students had been investigated 10 years before for inappropriately touching students at another school, but was allowed to continue teaching with only a warning letter, officials said. Wilbert Cortez, a computer teacher at P.S. 174 in Forest Hills, was arrested Thursday morning and accused of molesting two boys, ages 8 and 9, over the course of the 2010-11 school year, the Queens District Attorney’s office said. Cortez was expected to be arraigned on Thursday night, and the DA’s office did not know if he had...