Suspected Karbi Longri North Cachar Hills Liberation Front militants on Tuesday detonated a powerful explosion at the residential complex of Assam Cabinet Minister Khrasing Ingti at Howraghat in violence-hit Karbi Anglong hill district.

No one, including the minister who was sleeping at the time of the explosion, was injured in the explosion that made mockery of the geared up security arrangements in the hill district.

The minister is provided personal security guards by the Assam police.

Police informed that the KLNLF ultras aided by the banned United Liberation Front of Asom militants triggered the explosive deice fitted to the boundary wall of the minister's residence.

There was a 20 mt distance between the wall and the residential quarters in the campus.

Police informed that it was a powerful improvised explosive device triggered with the help of a manually operated detonator.

The explosion caused damage to the boundary wall besides causing damage to some window panes of the residence.

Police recovered 47 mt of flexible wires, batteries and plastic containers used as detonators from the site of the blast. It was detonated by militants hiding in the campus of a house in the neighbourhood.

"It is the ULFA that has been training KLNLF to use explosives. The KLNLF is known to have expertise in handling such explosives," a senior police official said.

The KLNLF, with the help of the banned ULFA, killed 29 Hindi-speaking persons including women and children in Karbi Anglong earlier this month.

The killings forced New Delhi to send additional Central forces to the hill district.

Following the recent carnage of Hindi-speaking people, New Delhi also instructed Assam government to reorganise the police and paramiltary force deployment in the sparsely populated but thickly forested hill district with 10,434 square km area.

The hill district had only six police stations and 11 outposts. The number of police stations is being doubled now.