Jaipur: State and Central intelligence agencies have been put on alert after an email threatening blast in Delhi on Independence Day was sent to various state chief secretaries, including Rajasthan Chief Secretary CK Mathew.

The email, forwarded on Friday by one Ajay Kashyap to the chief secretaries of Rajasthan, Delhi and few other states, claimed that a man from Bihar was planning to trigger blasts in Delhi on August 15, state intelligence sources said.

The email also contained specific details of the man, it claimed, would carry out the blasts, they said.

Efforts are on to trace the source of the email and the sender's identity.