This story has been updated.
All lanes have reopened after a serious motor-vehicle crash involving a state police cruiser and a tractor-trailer resulted in the closure of a stretch of I-684 late Friday morning.
The crash, reported just before 10:30 a.m., occurred northbound between the Saw Mill Parkway (Exit 5) in Katonah and Route 172 (Exit 4) in Bedford.
The left lane reopened at around 12:15 p.m. All lanes reopened at around 3 p.m.
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