The Chinese government still has no idea why a U.S. diplomat fell ill at the consulate in Guangzhou after hearing mysterious sounds, despite completing its investigation Thursday. On Wednesday, the State Department said it was evacuating several more Americans from Guangzhou for further health screenings. That follows the initial evacuation of a government employee, who had reported hearing strange noises in his apartment and exhibiting symptoms of brain injury. On Thursday, China’s Foreign Ministry said it had looked into the case after being told about the first incident. “China and relevant authorities conducted an investigation and gave feedback to the United States,” spokeswoman Hua Chunying told a regular news conference.