Delhi, May 30 -- The secretary of the Ministry of Heavy Industries received an e-mail on Friday threatening to blow up Udyog Bhawan, housing several central departments, sending the security apparatus into intense action, officials said.

The e-mail threatened to blow up the building near the Central Secretariat using an improvised explosive device (IED) was received in the noon, prompting security officials to evacuate the premises by 3.15 pm.

As per police officials, the bomb threat e-mail was sent to senior officials of the ministry, headquartered in Udyog Bhawan.

The email reportedly mentioned plans to target the building with an IED. Security agencies have launched an investigation, and bomb detection and disposal squads were immed...