A navy spokesman refuses to confirm whether the 'hydro-acoustic anomaly' was an explosion.
President Putin will send a survey vessel to the area where the sub vanished with 44 on board.
One man has been arrested and charged over the gruesome gang killing.
The 10 disappeared after the boats they were travelling on sank on the Colombia-Venezuela border.
A gay rights activist's bright yellow tomb has divided Italy - so should graves have to be grey?
The search steps up again as weather improves near where the Argentine boat vanished last Wednesday.
After the British Virgin Islands were hit by two category five hurricanes in September, BBC Sport discovers how they are recovering and aiming for sporting glory.
Fifa gives life bans to the former presidents of the Guam, Nicaraguan and Venezuelan football associations for corruption.
Haitians will have 18 months to return to the country or legalise their status in the US.
Whitefish Energy says payments have been delayed from Puerto Rico's bankrupt power authority.
How do subs disappear? And how long can crews survive in a submerged vessel?
The Argentine navy boat vanished off the coast last Wednesday and no trace has been found.
Ex-president Sebastián Piñera wins the first round, but fails to avoid a run-off in December.
More planes and boats are joining the search for the submarine which vanished last Wednesday.
The "cold chain" profoundly changed the food we eat and the way we shop.
Every few months, US authorities open the gate to the fence separating the two countries and allow families to meet without a visa.
Eight candidates are standing, with ex-president Sebastián Piñera seen as a clear favourite.
The Argentine naval submarine went missing on Wednesday with 44 crew on board
Katy Watson reports on how the growing polarisation in Brazilian society is affecting the arts.
Haitians granted protected status in the US face an uncertain future under the Trump administration.
Mayor Antonio Ledezma, who had been under house arrest since 2015, escapes to Spain.
A Nasa research plane joins the search for the vessel, now missing in the Atlantic for three days.
Chileans vote for a new president as President Michelle Bachelet comes to the end of her term.
A Mexican arrested in hospital by police over the killing of 72 migrants has since died.
After Mexico's devastating earthquake, locals could not afford to let the Agua Azul falls run dry.
Famous turquoise cascades are flowing again after locals used picks and shovels to remove debris.
Former football official Nicolás Leoz is a main suspect in a bribery and money-laundering scandal.
The procedure took 30 people three hours to complete. Tantor had been rescued from a ranch in Colombia.
A play-off victory over New Zealand gives the country its first qualification in 36 years.
Peru become the final side to qualify for next year's World Cup in Russia, beating New Zealand 2-0 in Lima.