All schools have been evacuated after local police was informed about the emails, Delhi Police officials said.
Bomb detection team, bomb disposal squad and officials of fire brigade have been rushed to the
Noida Police said that classes have been suspended in DPS, Noida and police force has been deployed.
"Taking immediate cognizance of the information, checking is being done around the school by the police force. Other necessary measures are also being taken," the Noida Police said in a brief statement.
More schools are said to have received a similar threat mail and it is suspected that one person was behind it all, an officer said.
Security agencies, including Delhi Police Special Cell, are looking to find the source of the email.