The U.S.-led NATO occupation in Afghanistan is facing a storm of violence and outrage over the burning of copies of the Koran by U.S. troops at the Bagram Air Base last week. Retaliatory attacks and public protests have swept Afghanistan, leaving more than 40 Afghans dead. On Sunday, six U.S. soldiers were injured in northern Afghanistan when a demonstrator threw a grenade at a U.S. base. Two senior U.S. Army officers were shot dead on Friday inside the Afghan Interior Ministry. In private, U.S. officials are expressing worry about the situation in Afghanistan. We go to Kabul to speak with John Wendle, a reporter for TIME and photographer for Polaris Images. “I think we’re going to continue to see attacks,” Wendle says. “[This] makes it difficult for the United States to pull out and achieve the one goal that it’s kind of set for itself, which is training the Afghan security forces so they can stand on their own two feet and provide security in this country.”