Westbound lanes of Highway 1 were shut down overnight after a police incident near Abbotsford.
Witnesses say there may have been a police pursuit between Chilliwack and Abbotsford.
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It started with a collision just west of Sumas Road.
Westbound lanes were closed for several hours while the Integrated Collision Analysis and Reconstruction Team investigated.
At this time there is no word on any injuries.
We will update this story when more information is available.