Nahida Bristy, 27, and Zamil Limon, 27, both international doctoral students from Bangladesh, went missing the morning of April 16 in Tampa. The case has been upgraded to Endangered based on new information indicating the circumstances warrant this classification. Zamil was last seen at his apartment at Avalon Heights around 9 a.m. Bristy was last seen around 10 a.m. at the Natural and Environmental Science building on the USF campus.