A police officer watches as an excavator digs up skeletons at a construction site in the former war zone in Mannar, about 327 km (203 miles) from the capital Colombo, January 16, 2014. The discovery of a mass grave containing more than 30 skulls in northern Sri Lanka has fuelled speculation that there may be many more like it containing the remains of thousands who went missing during the island nation's nearly three-decade war. The remains, which workers stumbled on as they dug up roadside paving for a water project, are yet to be identified. The first mass grave to be found in the former war zone, it is spread over an area measuring about 400 square feet (37 square metres) and is 5 feet (1.5 metres) deep. Picture taken January 16, 2014. REUTERS/Dinuka Liyanawatte (SRI LANKA - Tags: CONFLICT)