KABUL (Reuters) – A bomb blast in a passenger van in Kabul on Saturday killed at least one person, officials said, in the second explosion in the Afghan capital in two days, as security concerns rise on the eve of the Muslim holiday of Eid al-Fitr. “One woman was killed and three more injured,” Khalid Zadran, a spokesman for Kabul’s commander, told Reuters. A day earlier, an explosion killed more than 50 worshippers after Friday prayers at a Kabul mosque amid a spate of mosque attacks during the Muslim holy month of Ramadan. One witness to the passenger van blast, Ali Maisam, 19, who was waiti…