Thousands of Egyptians remain in Cairo's Tahrir Square after a huge rally to mark the first anniversary of the uprising which toppled President Hosni Mubarak.

Libyan militias are out of control and secretly holding thousands of detainees, as the government struggles to assert its authority, the UN hears.

Part of a multi-storey building collapses in the centre of Rio de Janeiro, with unconfirmed reports that up to 11 people are dead.

More than 10,000 people take to Poland's streets in protest at ministers signing a treaty activists say will result in internet censorship.

The US unveils a strategy at the Davos World Economic Forum to protect the global supply chain in the event of a terror attack or natural disaster.

Soldiers oust the PNG defence chief in the early hours, in a move apparently linked to the power tussle over the prime minister's job, reports say.

Argentinian President Cristina Kirchner condemns UK Prime Minister David Cameron for accusing her government of "colonialism" in the Falklands.

For the first time researchers achieve the "cloaking" of a three-dimensional object to make it invisible as viewed from any angle.