Communists oppose the pact with the US, which would give India access to nuclear fuel and technology, threatening to bring down the government.
A government-appointed committee says violence by the Maoist insurgency is growing and urges the government to talk with rebels.
The Maoist party had a surprisingly strong showing in recent elections. India is worried about the impact on its own Maoist rebel movement, the Naxalites.
Following Colombo's withdrawal from a 2002 truce with Tamil rebels, nation-building chief DM Dassanayake was fatally wounded in a roadside bombing.