When militants launched a brazen raid on India's Parliament in 2001, relations between India and Pakistan went into a tailspin that nearly ended in a fourth war between the nuclear rivals.

But the Indian response was markedly different following a series of bombings in New Delhi over the weekend that killed more than 50 people. Just hours after the attack, the Indian government struck an unprecedented accord with Pakistan to open parts of the Line of Control, the de facto border that divides the contested Kashmir region.

The surprise move sends a powerful message that India and Pakistan won't let extremists derail an increasingly substantial peace process. The scale of the earthquake disaster in Pakistan has certainly softened positions, but analysts also credit the latest breakthrough to the growing momentum of the negotiations over the past 21 months.

"Too much has been done on the peace process for it to be derailed by a singular act of terror," says Pushpesh Pant, professor of diplomatic studies at the Jawaharlal Nehru University in New Delhi. After troop reductions in Kashmir, and defense agreements like the prenotification of ballistic-missile tests, the peace process is nearly irreversible at this stage, says Mr. Pant.

Such optimism is tempered by more than half a century of enmity between the two countries, particularly over Kashmir, the Himalayan region claimed in its entirety by both sides.

It has yet to be established who was behind Saturday's triple, nearly simultaneous blasts. All three bombs exploded in Delhi's crowded markets during the festive Diwali holiday season when markets are thronged by people. The clear intention was to inflict as much damage and loss of life as possible.

Sajjan Gohel, director of International security at the Asia-Pacific Foundation in London, believes that such a well-coordinated attack aimed at inflicting mass tragedy points to transnational extremists sympathetic to Al Qaeda. "In the South Asian region, few have the capacity to pull off this handiwork of sabotage, other than the LeT," Mr. Gohel says, referring to Lashkar-e Tayyaba, a group blamed for the Parliament attack.

While a little-known group called the "Front for Islamic Uprising" took credit Sunday for the attacks, several security analysts suspect the group is a front for the LeT.

Gohel is concerned that the attacks could yet have a chilling effect here: "If Indian security agencies, in the course of their investigations, find out that Pakistan or ISI was behind the bombings, it could be a serious blow to the peace process."

India's initial response was swift, with Prime Minister Manmohan Singh condemning the blasts as a "dastardly act of terror." The entire country has been put on high alert.

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