Scientists in the US create robotic ants - tiny machines, which they say behave just like a real ant colony.

The London Olympic Park is reopened to visitors with 20,000 tickets sold in advance.

The Central African Republic's new leader says his government will look into mining contracts signed with South African and Chinese companies.

Health officials in the US state of Oklahoma warn 7,000 patients their dentist may have exposed them to HIV and hepatitis, urging them to get tested.

Dozens of Chinese miners are missing after a huge landslide near the Tibetan capital, Lhasa, buried their huts in the early hours.

New Zealand police arrest a man in connection with an assault on cricketer Jesse Ryder, who is in a medically induced coma in Christchurch.

Italy's political limbo continues as centre-left leader Pier Luigi Bersani fails to form a cabinet after a week of talks with other parties.

Boston's longest-serving mayor, Thomas Menino, announces he will not run for re-election after almost 20 years in the city's top office.