
WINONA, Minn. (AP) -- Authorities are asking for tips on what might have caused a diesel spill last week that caused a 6-mile slick on the Mississippi River.
Inspectors in Minnesota and Wisconsin have been searching for clues on the spill, which happened between Dakota and Lock and Dam No. 7 near Dresbach on Minnesota's southeastern border with Wisconsin. The slick was first noticed on Thursday.
Dave Morrison, emergency responder for the Minnesota Pollution Control Agency, says authorities haven't found what caused the spill, which dumped about 1,000 gallons of fuel into the river.
The U.S. Coast Guard has said no commercial traffic was in the area at the time of the spill.
The MPCA is asking anyone with information on the spill to call (507) 206-2644.
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