Afghan health officials said the death toll from a fuel tanker explosion in a tunnel north of Kabul has jumped to 31. The Health Ministry for the Taliban-led government also said the number of injured in the December 17 blast had risen to 37, and said both casualty figures were expected to climb further. Two days after the explosion, the cause was still unclear. The Salang Tunnel, located about 130 kilometers north of Kabul, was originally built in the 1960s and is a major transit link between northern and southern regions of Afghanistan. To read the original story from Radio Azadi, click here.