How Does One Unintentionally Burn Books?

A senior U.S. military official said Tuesday that the Korans were removed from the prison library because they had radical or inflammatory messages scrawled in them.
 "[I] assure you . . . I promise you . . . this was NOT intentional in any way.” Gen. John Allen, the top U.S. commander in Afghanistan said.
NATO Burns Korans

If the Koran's were removed due to radical or inflammatory scrawlings, how can this General claim the burnings weren't intentional? They were accidently dropped into a fire after being removed from the library?