Article Photos: Ky. evacuation indefinite as chemical tanker burns

Flames can be seen from the air after an explosion happened at the sight of a train derailment in southern Jefferson County, just south of Louisville, Ky, Wednesday, Oct. 31, 2012. (AP Photo/The Courier-Journal, Sam Upshaw)

Flames can be seen from the air after an explosion happened at the sight of a train derailment in southern Jefferson County, just south of Louisville, Ky, Wednesday, Oct. 31, 2012. (AP Photo/The Courier-Journal, Sam Upshaw)