handed over

to the Tanzania-based International Criminal Tribunal for Rwanda.

World News from the BBC

The Nato-led international force in Afghanistan say that seven American soldiers have been killed in a single incident. They died when two roadside bombs exploded in southern Afghanistan. From Kabul, here's Quentin Sommerville.

The troops were on a foot patrol in the south of the country when they triggered two IEDs, or improvised explosive devices. The Nato-led mission has released few other details, but this is a heavy loss from one incident. IEDs are widely used by the Taliban and account for most of the casualties in Afghanistan. Soldiers fighting here are well protected from the bombs when they are in their vehicles, but foot patrols allow troops to get closer to the population and the enemy.

The United States Supreme Court has

upheld

a law in the state of Arizona which gives its courts the power to shut down businesses that employ illegal migrants. In a 5-3 decision, the Supreme Court rejected arguments by businesses, civil rights groups and the Obama administration that Arizona's law was

in conflict with

federal legislation.

Researchers have discovered that Arctic reindeer can see ultraviolet light that would blind humans. The lead researcher says that the animals may have evolved ways of protecting their retinas against the kind of extreme exposure to UV light common in the Arctic. Here's Neil Bowdler.