A grenade exploded in front of the main gate of an Assam Rifles unit here on Saturday but there was no casualty.
An Assam Rifles spokesman said that a 42-year-old civilian, apparently inebriated, allegedly lobbed the grenade at a drain in front of the unit gate located at Madanriting in the city on Saturday evening.
The person, identified as Petros Nongdhar of Mawshabit locality, was detained by the jawans and handed over to police.
The accused claimed to have got the grenade from a firing range in the city.
Assistant Superintendent of Police (Crime) Vivek Syeim said that investigation was on to ascertain how the person got the grenade and the purpose of his action.