The U.S. Education Department announced an investigation Wednesday into whether Los Angeles schools are serving the needs of students who do not know English. Ramon Cortines, superintendent of the Los Angeles Unified School District, is cooperating with the investigation, officials said. Assistant Secretary for Civil Rights Russlynn Ali said only 3 percent of students in English Learner programs are proficient in math and English. "At this time, we have reached no conclusion as to whether any violations of federal law exist," Ali said. "But the number of EL students and children of color in Los Angeles is large. It is...