Officials from the Connecticut Department of Transportation said Route 15 was closed in Westport because of a vehicle fire.
According to the DOT, Route 15 north was closed between exits 42 and 44.
It was unknown how long the highway would be closed or if anyone has been injured.
No other information was released.
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The Islamic State militant group released a video Tuesday that it claimed shows the beheading of American journalist Steven Sotloff.