Iran is pressing ahead with the construction of a research reactor that Western experts say could offer it a second way of producing material for a nuclear bomb if it decides to make one, a U.N. report showed on Wednesday.

A blockbuster study in which US researchers reported that they had turned human skin cells into embryonic stem cells contained errors, its lead author has acknowledged.

At least six cars were torched in a Stockholm suburb late Thursday, as the Swedish capital braced for a fifth night of riots.

The Google chairman, Eric Schmidt, has told political leaders to sort out a rational and predictable international tax system, as he faced a wave of criticism over the firm's failure to pay more tax.

Republican US lawmakers are taking steps to bar the United States from sharing classified missile defense technology information with Russia, draft legislation that was amended in the US Congress Wednesday shows.

London is shocked by the most brutal murder imaginable, as two al-Qaeda-inspired Islamist terrorists hacked at their victim "like a piece of meat" in an "animal" frenzy on the suburban pavement. The attack on the soldier was so brutal that it appeared as if "they were trying to remove organs", according to one man who witnessed the first terrorist murder on British soil in eight years.

President Obama said Thursday that al Qaeda is nearly defeated and the war on terrorism has changed since he took office, and that demands a broad rethink that includes scaling down drone attacks, transferring detainees from Guantanamo Bay and revisiting the 2001 congressional resolution that set the country on perpetual war footing.

Three nights of violent rioting by immigrant youth in the suburbs here have seen dozens of cars burned, multiple police officers injured, numerous windows shattered, schools set ablaze and more.