This story has been updated.
The northbound crash occurred at the merger to the Saw Mill River Parkway in Bedford, with delays to Route 172 (Exit 4).
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A serious crash with multiple injuries caused gridlock on a stretch of I-684 during much of the Tuesday evening commute.
The northbound crash occurred at the merger to the Saw Mill River Parkway in Bedford, with delays to Route 172 (Exit 4).
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