India, Feb. 18 -- The Special Task Force (STF) of the Uttarakhand Police launched a probe into a series of bomb threats mailed to courts across the state, officials said.

Police officials said the investigation is underway to trace the origin of the emails and identify those responsible.

Over the past three days, similar threats were reported from courts in Nainital, Uttarkashi, Rudraprayag, Haridwar, Pithoragarh and Tehri Garhwal, triggering heightened security measures.

Senior superintendent of police (STF) Ajai Singh said preliminary investigations suggest that the threats appear to be hoaxes.

"We have initiated an investigation into the matter. The emails seem to have been sent using a VPN to conceal the sender's identity," he sai...