Banned United Liberation Front of Asom militants attacked an army convoy at Gelapukhuri near Assam's business hub Tinsukia on Friday night, killing a soldier and injuring two.

A police source in Tinsukia informed that a three-vehicle army convoy was carrying food to the base in the outskirts when militants lobbed a grenade.

Of the three soldiers injured, one succumbed to his injuries at the Army Hospital at Dinjan base.

The army and the police cordoned off the area and launched a combing operation. The lever of the grenade was recovered from the site of incident.

Tinsukia, along with a few other upper Assam areas, was marked vulnerable in the run up to Independence Day as per the latest strategy drawn up by the three-tier unified command engaged in counterinsurgency operation in Assam.

Intelligence agencies have alerted the state government about the possibility of ULFA attacks as the group might try to avenge latest killings of at least a dozen of its senior leaders by the army and police in different parts of the state.

The unified command comprising the army, police and paramilitary forces has been in operation in the state since 1997 to tackle the insurgency problem.