An art dealer is arrested and accused of smuggling a tonne of African ivory into the US for sale at his Philadelphia store.

A US official apologises and tells Congress he shares responsibility for a botched operation to track the illegal movement of guns to Mexico.

Egypt's former President Hosni Mubarak is weak, depressed and refusing solid food, say officials at the hospital where he is being held pending trial.

A South American dolphin is the first "true mammal" to sense prey by their electrical fields, scientists report.

International concern is raised over a Kosovo police bid to take over border crossings in the ethnic Serb north in which one officer was killed.

The White House considers a presidential veto of a Republican debt limit plan, as Speaker John Boehner struggles to win over his own party.

Spanish activists, known as "the Indignants", march from Madrid to Brussels to protest against governments' handling of the economic crisis.

Nigeria's leader Goodluck Jonathan says he will ask MPs to amend the constitution so that future presidents serve a single, longer term in office.