From correspondents in Uttar Pradesh, India, 12:00 PM IST

Security at the residence of former Uttar Pradesh chief minister Ram Naresh Yadav has been tightened following a threat from the Indian Mujahideen terrorist group to assassinate him, police said Wednesday.

A letter from the militant group's area commander Sarfaraz Khan was received at the Congress leader's residence here Tuesday.

According to police inspector Ajit Singh Chauhan, the letter states that Yadav would be killed soon, along with his family.

'We have informed the ATS (anti terrorist squad) and intelligence officials about the letter. We are making every effort to trace the origin of the letter and nab its sender,' Deputy Inspector General of Police N.K. Srivastava told reporters.

(Staff Writer, © IANS)