NOIDA: Several schools in Noida, including Shiv Nadar School, Cambridge and Army Publich School were evacuated and closed on Friday after receiving bomb threat mails.Bomb disposal squads and police teams were deployed on site to conduct thorough searches.The school administration suspended all classes immediately to allow security personnel to carry out a complete sweep of the premises.Authorities are investigating the source of the email, and no explosives have been found so far.Parents have been advised to await official updates.