Nearly 50 people died when a packed commuter train slammed into a retaining wall at a railway terminus during morning rush hour in the Argentine capital Buenos Aires.
Inmate evacuationIndonesia says it will evacuate all 60 foreigners as well as female prisoners from Kerobokan jail, which is currently under the control of rioting inmates.
Journalists killed
Tributes are being paid to respected war correspondent Marie Colvin after her death in an artillery barrage in the Syrian city of Homs.
Tempers flareTempers have flared between Rick Santorum and Mitt Romney in a fiery debate among US Republican presidential candidates.
Vindicated?A controversial finding that brought doubt on Einstein's belief that nothing can travel faster than light could have been caused by a loose cable.
'Best and most fearless'
Marie Colvin, who died trying to draw attention to Syria's plight, has been remembered for her exceptional bravery.
Troops boost
The UN Security Council has boosted an African Union peacekeeping force which is battling Islamist rebels in Somalia.
One year on
Tens of thousands of New Zealanders turn out to mark the first anniversary the Christchurch earthquake.
Up close and personal
ABC's Craig McMurtrie takes a look at one of the US drones being used for targeted killings in Pakistan and Afghanistan.
Carnival gallery
Brazilian cities come alive with a riot of colour and costumes as dancers celebrate the annual Carnival festival.
Koran flashpoint
Furious Afghans protest outside a US military base over a report foreign troops had burned a large number of Korans.
Yemen votes
Yemen seals president Ali Abdullah Saleh's exit from power, electing his deputy to lead the country from the brink of civil war.
Hunger strike over
A Palestinian held without trial by Israeli authorities has ended a 66-day hunger strike after Israel promised to release him.
'I have beaten Christ'
Zimbabwean president Robert Mugabe declares himself 'fit as a fiddle' and pushes for new elections on his 88th birthday.
PM in exile
Exiled Tibetan prime minister Lobsang Sangay tells Lateline he wants an investigation into human rights abuses in Tibet.
The Maine event
Mitt Romney has been declared the winner of the Maine caucuses, but supporters of Ron Paul are crying foul.
Mammoth task
Fruit seeds stored by squirrels 30,000 years ago and found in Siberian permafrost are regenerated into flowering plants.
Ice carnage
Vast blocks of ice have surged down the River Danube, destroying boats, pontoons and floating restaurants in Belgrade.
Dominique Schwartz, Auckland
Zoe Daniel, Bangkok
Stephen McDonell, Beijing
Huey Fern Tay, Beijing
Matt Brown, Jakarta
Helen Brown, Jakarta
Ginny Stein, Johannesburg
Philip Williams, London
Rachael Brown, London
Norman Hermant, Moscow
Anne Barker, Middle East
Richard Lindell, New Delhi
Liam Fox, Port Moresby
Mark Willacy, Tokyo
Lisa Millar, Washington
Craig McMurtrie, Washington
Michael Brissenden, Washington
Jane Cowan, Washington
Republican presidential candidates Rick Santorum (left) and Mitt Romney share a laugh after a debate in Mesa, Arizona on February 22, 2012.
Gillard and Rudd are not the only Asia Pacific leaders with a personalities problem.
The line between legitimate public grief and exploitation is razor fine.
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AEDT = Australian Eastern Daylight Savings Time which is 11 hours ahead of UTC (Greenwich Mean Time)
Afghans rage against Koran burning
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Strauss-Kahn questioned amid prostitution investigation
Christchurch remembers quake victims