Indian Prime Minister Manmohan Singh said Tuesday that it "cannot be business as usual" with Pakistan after clashes in disputed Kashmir and called for those behind the killings of two Indian soldiers to be brought to justice.
"After this barbaric act, there cannot be business as usual (with Pakistan)" Singh said in New Delhi, announcing the government's plan to suspend a new visa-on-arrival scheme for senior Pakistani citizens.
"Those who are responsible for this heinous act will have to be brought to book ... I hope Pakistan realizes this," he said.
The deaths of the Indian soldiers on January 8 - whose bodies India has claimed were mutilated by Pakistani soldiers - were "unacceptable," Singh said.
Two soldiers each have been killed on both sides in the most serious clashes on the Line of Control (LoC) - a de facto border that divides Kashmir between Pakistan and India - since the nuclear-armed neighbours announced a ceasefire in 2003.
Pakistan and India have fought two of their three wars over Kashmir since their independence from Britain in 1947.
Indian Foreign Minister Salman Khurshid declined to clarify what "tangible" measures his country would take to stop "business as usual" with Pakistan.
"I think it's best that we leave it at this point. I think specifics of what might be necessary or found useful are decisions that will be taken as we move forward," he said.
He said India had asked the Pakistani authorities to investigate the killings.
"Such actions by the Pakistan Army, which are in contravention of all norms of international conduct, not only constitute a grave provocation but lead us to draw appropriate conclusions about Pakistan's seriousness in pursuing normalization of relations with India," Khurshid said.
The visa agreement, which was to go into effect Tuesday, was part of measures to improve relations that were at a low following the terrorist attacks in Mumbai in 2008.

Under the agreement, Pakistani citizens above 65 years were to be issued visas on arrival at the western border post at Wagah.
Indian Home Secretary RK Singh had earlier Tuesday said technical glitches were behind the suspension of the visa agreement. No new date was given for its implementation.
Meanwhile, nine Pakistani players will not participate in the Hockey India League (HIL) and would be sent home, the league's chief said. Members of the right-wing Hindu Shiv Sena party recently held protests as the players practised in Mumbai.
"Both Hockey India and Pakistan Hockey Federation have mutually decided this. We did not want them to play under any sort of pressure," said HIL Chief Narinder Batra.