Bengaluru, Sixty-eight private schools in and around the city on Friday received emails warning of bomb threat on their premises, triggering panic among the staff and parents, police said. The school authorities immediately alerted police, who reached the institutions concerned with the bomb disposal squads and anti-sabotage check teams, they said, while indicating the bomb threat could be a hoax. Karnataka Chief Minister Siddaramaiah said he has asked police to seriously investigate the e-mail…