An email, purportedly sent by the Indian Mujahideen, has threatened that the outfit will kill senior Bharatiya Janata Party leader L K Advani during his scheduled visit to Shillong on September 29.
The email, written in English, was dispatched to some local newspaper houses on Wednesday night, sending the entire police machinery in the state into a tizzy.
Signed by self-styled North-East Field Commander of IM Ali Hussain Badr, the email said Advani's "Hindutva demand has pushed India into a fascist mould".
Meanwhile, the senior police officials held a high-level meeting with Chief Minister Donkupar Roy.
The police visited a newspaper house where the email was sent and analysed it.
"We can't say anything now, we are trying to trace the IP address," a senior police official told PTI, adding that prime facie it appeared that the email was sent from Shillong itself.
The Indian Mujahideen has claimed responsibility for the recent spate of terror attacks in New Delhi, Ahmedabad and Bengaluru.
