Speaking tough against the backdrop of its continued denials, Prime Minister Manmohan Singh accused Pakistan of utilizing terrorism as state policy and said given the "sophistication and military precision" of the Mumbai terror attack, it must have had the support of some official agencies in that country.

He also said those incharge of terrorist infrastructure in Pakistan have resorted to other stratagems to infiltrate terrorists into India via Nepal and Bangladesh though it has not totally ceased via the Line of Control.

Addressing a day-long conference of Chief Ministers on the internal security, Singh said concerns may exist that the country's defence mechanism to thwart the numerous threats were inadequate and that there may be criticism that the range of instruments to deal with internal security threat were not sufficiently sophisticated.

"Clearly, there is need to review the effectiveness of our set up for the collection of technical signal and human intelligence. The training and equipment provided to our security forces also requires a careful review," he said.

Admitting that a great deal more needs to be done, Singh said both the Centre and the state governments must attend to this task with speed, efficiency and utmost dedication.

In his 30-minute speech, the Prime Minister referred to multi-dimensional challenges of different kinds of which the most serious threats were those posed by terrorism, Left wing extremism and insurgency in the Northeast.

"Extremism is primarily indigenous and home grown. Terrorism, on the other hand, is largely sponsored from outside the country, mainly Pakistan, which has utilised terrorism as an instrument of State policy," he said.

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