India's prime minister said Thursday that those behind coordinated attacks against Mumbai were based "outside the country" and warned "neighbours" who provide a haven to anti-India militants. In a televised address to the nation, Manmohan Singh also appealed to the country to "maintain peace and harmony" in the wake of the attacks that left at least 100 dead and up to 300 more wounded. "The well-planned and well-orchestrated attacks, probably with external linkages, were intended to create a sense of panic, by choosing high profile targets and indiscriminately killing foreigners," Singh said. "We will take up strongly with our neighbours that the use of their territory for launching attacks on us will not be tolerated, and that there would be a cost if suitable measures are not taken by them," he added.