CASSELTON, N.D. (AP) - Authorities say air quality appears to be improving after a fire from the derailment of a crude oil-carrying train in southeastern North Dakota.
The BNSF Railway train derailed Monday near Casselton, prompting the evacuation of about two-thirds of the town's 2,400 residents.
Cass County Sheriff's Sgt. Tara Morris says air quality is being tested by a contractor hired by the railroad. Morris said Tuesday morning there have been improvements in air quality readings but authorities weren't yet prepared to "give the all-clear.''
The town's water tower is about half-covered with soot. Cass County Sheriff Paul Laney says he expects a lot of soot around town.
The derailments cause isn't known. No one was hurt.