In the wake of serial blasts in Assam, the Centre on Tuesday said the ULFA has waged a virtual war against the country and it has strong reasons to believe that the banned outfit was behind the recent violence in the state.

"It (ULFA) has waged a virtual war against the Indian State for many years. Government has made it clear that it will not yield to ULFA's demands," a Home Ministry statement said, a day after three blasts and a grenade attack rocked the northeastern state killing nine persons and injuring 70.