A three-vehicle crash on eastbound Hwy. 401 in Alnwick/Haldimand is causing congestion along the highway.
Around noon, Northumberland OPP confirmed the crash, just west of Grafton, and said one lane of traffic was getting by.
Police are urging motorists to slow down and leave space for emergency crews at the scene.
Updates will be provided when more information becomes available.
(Written by: Sarah Hyatt)
