India's top court ruled Tuesday that an Italian marine detained for the 2012 killing of two fishermen must return in January after he was allowed to go home for medical treatment.

The Supreme Court had given Massimiliano Latorre leave to spend four months at home after he suffered a cerebral ischaemia -- a restricted blood supply that can lead to a stroke -- in September.

A group of upper-caste men shot dead four lower-caste fishermen in eastern Indian for refusing to hand over their catch, police said Monday.

The victims were killed late Sunday while fishing at a pond in their village in impoverished Bihar state, senior state police official Jitendra Rana told Agence France Presse.

Indian Kashmir's main city of Srinagar voted Sunday in continuing elections in the troubled Muslim-majority region, where the party of Hindu nationalist Prime Minister Narendra Modi is making an unprecedented bid for power.

As armed police patrolled the streets in bulletproof vests, voters queued to cast their ballots in freezing weather in Srinagar and the Kashmir Valley, where a separatist campaign is centred.

The leader of Crimea on Thursday visited India as part of a delegation led by Russian President Vladimir Putin, saying he was seeking investors to help develop the peninsula annexed by Russia.

Moscow seized Ukraine's Black Sea peninsula in March, sending East-West relations to post Cold War lows and leading U.S. and Europe to impose sanctions on Russia.

Russia will build 10 more nuclear reactors in energy-starved India, Prime Minister Narendra Modi said Thursday, after talks with President Vladimir Putin aimed at shoring up ties between the long-time allies.

Putin is in New Delhi seeking to strengthen energy, defense and strategic ties in Asia in an attempt to revive Russia's economy, badly hit by U.S. and EU sanctions over its backing of an uprising in Ukraine and annexation of Crimea.

Pakistani marine forces on Thursday arrested 58 Indian fishermen for allegedly violating territorial waters in the Arabian Sea, police said.

"The Maritime Security Agency arrested 58 Indian fishermen," senior police officer Shiraz Nazir told Agence France Presse, adding that the authorities also seized 11 boats.

Police apologized for failing to prevent a man from disrupting the Nobel Peace Prize ceremony in Oslo Wednesday after he brandished a Mexican flag near laureates and the Norwegian royal family.

"It's a breach in security for which we apologize," Oslo police Chief John Fredriksen told reporters. "It shouldn't have happened."

Russian President Vladimir Putin will seek to "recharge" ties when he visits India Wednesday for a one-day summit, promising deals on natural gas and new nuclear power units for the energy-starved country.

India -- the world's third largest oil importer behind the United States and China -- has been buying oil mainly from the Middle East but the region's volatility has prompted the government to consider other options.

Militants hurling grenades stormed an army camp in Indian Kashmir on Friday, killing 11 troops and police in a day of violence in the Muslim-majority state where local elections are being held.

Six of the attackers also died in the audacious raid on the barracks in Uri, near the heavily militarized Line of Control (LoC) dividing the disputed Himalayan territory between India and Pakistan.

Five children were killed on Thursday when a school bus collided with a moving train at an unmanned railway crossing in northern India, local authorities said.

Another 13 people, including the driver, have been taken to hospital for treatment after the crash in Uttar Pradesh state.