LONDON — Gordon Brown may lead efforts to revive the nuclear Non-Proliferation Treaty (NPT) as a way of tackling Iran’s atomic ambitions, his most pressing foreign policy challenge once he becomes British prime minister.

JUBA (Reuters) — South Sudan’s president has called for rebels from the western Darfur region to meet in his capital to build consensus ahead of possible peace talks to end a four-year-old insurgency and humanitarian crisis.

RAMADI — Crouched around the camera’s high-tech screen, the US Marines watch flames burn the camouflage netting around one of their lookout posts on a nearby roof, just hit by a burst of machinegun fire.