World news from the BBC.
The US secretary of state Hillary Clinton has called for major changes to the leadership of the Syrian opposition. Mrs Clinton said talks planned for next week in Qatar should ensure that those who were inside Syria fighting against President Assad's government were represented. She said many other leaders at the Syrian National Council hadn't been inside Syria for decades.
This cannot be an opposition represented by people who have many good
attributes
, but have in many instances not been inside Syria for 20, 30 or 40 years. There has to be a representation of those who are on the front lines fighting and dying today to obtain their freedom.
A group of Ecuadorians say they'll sue the oil company Chevron in Argentina in an attempt to seize Chevron's assets there. The Ecuadorian
plaintiffs
accused Chevron of polluting land in the Amazon region for almost three decades. Last year, an Ecuadoran court ordered Chevron to pay $19 billion in damages.
Archaeologists in eastern Bulgaria say they've unearthed the oldest prehistoric town ever found in Europe. Our central Europe correspondent Nick Thorpe reports.
A dome of rock-salt descents almost 4,000 meters beneath the deep Karst gorge of Provadia, above it, Archaeologists have uncovered a
fortified
town with massive stone walls dated to between 4700 and 4200 BC. The settlement was home to about 350 people, who boiled salt water from springs nearby into salt bricks. The salt was used to preserve meat which began to be traded in large quantities in the late stone age. The discovery almost certainly explains the wealth found exactly 40 years ago at a cemetery on the outskirts of Varna 35Km away, the oldest hoard of gold objects found anywhere in the world.