"We have arrested Khajin Haloi after we traced that he was the person who made the call to the TV channel yesterday," East Khasi Hills SP M Kharkrang told PTI.
Police is yet to find out whether he made a hoax call or he is himself involved in militant activities.
He said the Koria Bijolighat resident in Nalbari district was arrested from Rynjah area in the city this evening.
The mobile phone he used to make the call was also seized and the call details proved the call.