Prime Minister Manmohan Singh said a deadly guerrilla raid such as the one launched on India's parliament in December 2001 that brought the nuclear-armed neighbours close to war could "greatly upset the (peace) process".

"We believe not enough has been done to dismantle the structures of terrorism," Singh told reporters in the Indian capital Monday night.

There has been an upsurge of violence in Indian-held Kashmir since the launch in April of a trans-Kashmir bus service across the Line of Control (LoC), the de facto border dividing the territory, aimed at reuniting families separated for decades.

India accuses Pakistan of arming and training Islamic rebels to fight its rule in the Indian zone of Jammu and Kashmir, a charge Islamabad denies.

Singh said he expected Pakistan President Pervez Musharraf to live up to the promise he gave former Indian premier Atal Behari Vajpayee to stop areas under Islamabad's control from being used for attacks on Indian targets.

His warning came just six weeks after he and Musharraf described the nearly 17-month-old peace process as "irreversible" at the end of talks in New Delhi.

Singh said he had made it clear to Pakistan that reining in "terrorist elements" was a precondition to carrying forward the peace process.

"I sincerely hope the government of Pakistan will do all it can to control these (militant) elements," he said.