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Argentina train crash 'kills 49'

A commuter train crash at a station in the Argentine capital, Buenos Aires, kills 49 people and leaves at least 600 injured, officials say. full story.

Western journalists die in Homs

American Marie Colvin of the UK's Sunday Times and French photographer Remi Ochlik are among 60 people killed as Syria steps up its clampdown. full story.

Somalia militants lose key town

Ethiopian and Somali troops capture Baidoa, a strategic stronghold of al-Shabab Islamist militants, as the UN approves extra African Union troops for Somalia. full story.

EU court to rule on Acta legality

A controversial anti-piracy agreement is to be referred to the EU's highest court due to concerns surrounding internet freedoms. full story.

Male extinction theory challenged

A new study comparing chromosomes in humans and rhesus monkeys suggests genetic decay of the male sex chromosome has all but ended. full story.

Cherie Blair starts hacking case

Cherie Blair has started legal proceedings over phone hacking, her solicitor confirms. full story.

Six dead in Afghan Koran protests

At least six people are killed and dozens injured in Afghanistan as protests spread over the burning of the Koran at a US airbase near Kabul. full story.

Obama seeks US corporate tax cut

US President Barack Obama proposes a cut in corporate tax and an end to tax loopholes, as part of his election-year strategy on the economy. full story.

Strauss-Kahn released by police

Former IMF head Dominique Strauss-Kahn is released after two days of questioning over an alleged prostitution ring but will be quizzed again next month. full story.

Alarm over UK-French drone theft

A briefcase filled with documents relating to a new Franco-British drone project is stolen in Paris, reports say. full story.

More bodies from Concordia found

Search teams in Italy find eight more bodies in the wreck of the cruise ship Costa Concordia which capsized on 13 January as the inquiry spreads. full story.

Time link to sudden cardiac death

How the time of day can increase the risk of dying from an irregular heartbeat has been identified by researchers. full story.

VIDEO: Colvin 'defined by her humanity'

Tributes have been paid to Marie Colvin, the highly respected American Sunday Times reporter, following her death in the Syrian city of Homs. full story.