NEW : 2 possible suspects are in custody , a local police sergeant says . NEW : There was a loud noise after a bomb threat was made , according to police . An assistant principal suffers smoke inhalation and is taken to hospital . In addition to firefighters , Memphis police and members of the federal Bureau of Alcohol , Tobacco , Firearms and Explosives were on site Thursday afternoon , the fire department lieutenant said . It appears to be a prank , a police spokeswoman says .
NEW : 2 possible suspects are in custody , a local police sergeant says . NEW : There was a loud noise after a bomb threat was made , according to police . An assistant principal suffers smoke inhalation and is taken to hospital . It appears to be a prank , a police spokeswoman says .