Security video from a RV dealership in Mount Vernon captured Thursday night's Interstate 5 bridge collapse into the Skagit River and the events that leading up to it.

Robin Brigge, service manager at Blade Chevrolet and RV, said the 3 to 4 seconds of video taken around 6:55 p.m. from their security camera system shows a truck with a big box structure going over the bridge, then the span collapsing moments later.

You see (the truck) hook the girder...he's on the freeway doing 55 mph, said Brigge. You can watch the bridge tumble into the river.

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