2 University of South Florida doctoral students missing for nearly a week: Police

Two doctoral students at the University of South Florida have not been seen in nearly a week, authorities said Tuesday, while seeking the public's help in finding them.

The missing students -- Zamil Limon and Nahida Bristy, both 27 -- were last seen at separate locations in the Tampa area on April 16, according to the University of South Florida Police Department.

Limon was last seen at his Tampa residence at approximately 9 a.m., and there has been no confirmed contact with him since then, police said.

Bristy was last seen on the USF Tampa campus at the Natural & Environmental Sciences Building at approximately 10 a.m., police said.

The two students are friends, and a mutual acquaintance reported them missing, according to a University of South Florida Police Department spokesperson. The individual notified the school's police department at approximately 4:50 p.m. on April 17 after being unable to contact them both, authorities said.

Both students have been entered into state and national missing persons' databases, police said.

Limon is pursuing a degree in geography, environmental science and policy, and Bristy is studying chemical engineering, police said.

Detectives with the University of South Florida Police Department and the Hillsborough County Sheriff's Office are investigating their disappearances.

Anyone with information on their whereabouts is urged to call the University of South Florida Police Department at 813-974-2628.