Motorcycle borne youths lobbed a grenade near Bolanguri bus stand at Kuklun Road area of Bijni town critically injuring three persons working in a garage nearby.
In another incident within a few minutes of the first, another grenade exploded near No 2 Bhetgaon area of the town but nobody was injured in the explosion.
The injured, identified as Palan Mandal, Sujannam Das and Sujan Arya, have been hospitalized in a critical condition.
A massive search operation has been launched to nab the culprits.
Chirang superintendent of police Ranjan Bhuyan and senior civil officials of the district administration rushed to the spot and reviewed the situation.
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