Student reporters at the Kentucky Kernel told ABC 36 the bogus threat still has their classmates asking a lot of questions about their safety.

The University of Kentucky sent out an alert just after 1:00 a.m. Saturday after an explosion was reported in a storm drain at the corner of Rose Lane and Linden Walk. An arson investigation is underway, according to the Lexington Fire Department.

Kentucky Children's Hospital in Lexington has stopped doing pediatric cardiothoracic surgeries pending an internal review, according to a spokesman at the University of Kentucky.