Dense fog is partly to blame for two separate accidents that occurred within minutes of each other this morning in western Iowa’s Pottawattamie County. One person was hurt when her vehicle collided with another on Highway 92 between Carson and Treynor. A few minutes later, a semi-truck was on its side between Treynor and Council Bluffs and 15 other vehicles were involved in a chain-reaction wreck, though no serious injuries were involved. Westbound Highway 92 was closed for about an hour for wreckers to remove the vehicles.