JALALABAD (AFP) - Student demonstrators on Monday demanded that an Afghan soldier sentenced to death for killing five French soldiers be spared execution. A military court last week rejected an appeal by the soldier, Abdul Sabor, and the Afghan authorities have since executed 14 death row prisoners in two groups including several Taliban insurgents. Unconfirmed Afghan media reports have suggested that Sabor is among a third group that President Hamid Karzai has approved for execution. Karzai’s office has refused to comment on the issue. So-called green-on-blue attacks have spiralled this year, with a total of 61 NATO soldiers killed by members of the Afghan security forces, fuelling distrust between the allies in the war against the Taliban militants.