Pakistan's prime minister pledged Wednesday to respond to rising tensions in disputed Kashmir with "restraint and responsibility" as officials accused India of killing another civilian by firing across the border.

Nawaz Sharif said it was vital to defuse the recent escalation of tension in the Himalayan territory, which has been the cause of two wars between the neighbors.

A diesel-powered Indian submarine exploded and sank Wednesday in a Mumbai dock, killing an unknown number of 18 crewmen on board and setting back the navy's ambitious modernization drive.

The fully-armed INS Sindhurakshak, returned by Russia earlier this year after a major refit, is nose-down in the water, with just a small part visible above the surface, the navy said.

Pakistani Prime Minister Nawaz Sharif called for a "new beginning" in relations with India in comments published Tuesday, as tensions remained high over the disputed region of Kashmir.

Recent clashes across the heavily militarized Line of Control (LoC), which divides the Himalayan territory between India and Pakistan, have raised the temperature between the nuclear-armed neighbors.

U.N. chief Ban Ki-moon waded into the controversy surrounding U.S. drone strikes during a visit to Pakistan Tuesday, insisting they must operate within international law.

The CIA has carried out hundreds of missile strikes on suspected militants in northwest Pakistan since 2004 and the campaign is a major thorn in relations with the U.S..

Hackers have attacked the Tibetan government-in-exile's Chinese-language website with an unidentified virus, making the portal inaccessible, an official spokesman told Agence France Presse Tuesday.

"Our office cannot access the website and we are trying to figure out what kind of virus is responsible for the problem," Tashi Phuntsok, spokesman for the exiled government based in the north Indian town of Dharamshala, told AFP.

Pakistan accused India on Monday of killing a civilian with "unprovoked firing" in Kashmir in the latest in a series of recent clashes in the disputed Himalayan region.

Tensions have flared again in the heavily militarized Kashmir valley with the nuclear-armed neighbors accusing each other of cross-border firing.

India launched its first indigenously-built aircraft carrier on Monday, a landmark moment in the $5 billion project that seeks to project the country's power and check the rising influence of China.

When the INS Vikrant comes into full service in 2018, India will become the fifth nation to have designed and built its own aircraft carrier, pushing ahead of China to join an elite club that includes Britain, France, Russia and the United States.

Pakistan Sunday accused Indian forces of firing on its border posts in disputed Kashmir and in neighboring Punjab province, where it sparked an "intermittent exchange of fire" between the two sides.

The fighting is the latest in a spate of recent cross-border skirmishes between the two nuclear-armed neighbors who have fought three wars since independence from the British rule in 1947, two over the Muslim-majority region of Kashmir.

The Royal Bank of Scotland Group has said it plans to sell some of its Indian assets, including its credit card and mortgage business, to a domestic bank as it disposes of more of its once sprawling empire.

RBS, now more than 80 percent owned by the British government following the 2008 global financial crisis, plans to sell its business banking, credit card business and mortgage loan portfolio to India's Ratnakar Bank, the two banks said.

Kencho Tshering, a red-robed Buddhist monk, takes a call from the King of Bhutan's office, then duly dashes off to start a ceremony praying for a break in the monsoon rains.

But while he may be on speed dial for royal requests, the clout of his fellow monks is on the wane in the remote kingdom as it absorbs the impact of technology and democracy as well as an abuse scandal.