A bomb threat was reported to the police at about 9:15 a.m., Mannina said.
Students were evacuated from Metropolitan Arts & Tech High School at 2340 Jackson St., and a bomb squad responded, he said.
A canine unit could not detect the reported bomb, and the threat was found to have no merit, Mannina said.
Police were allowing students back in the school by about 11 a.m., Mannina said.
School officials could not immediately be reached.
