WILSONVILLE, Ore. -- Two inmates in a roadside work crew were struck by a semi-truck on Interstate 5 near Wilsonville Tuesday morning, according to Tualatin Valley Fire &Rescue.

The crash caused a major traffic backup as authorities responded to the scene.

One of the victims was taken to Oregon Health & Science University hospital. Her injuries were serious, but did not appear to be life-threatening, according to TVF&R spokesman Piseth Pich. The other inmate was treated at the scene.

The driver of the semi-truck was transported by ambulance to Legacy Meridian Park Medical Center.

Two of the three southbound lanes of I-5 were blocked at the North Wilsonville exit during the investigation. A major backup quickly formed and drivers were warned to expect major delays. Asection of Southwest Boones Ferry Road that parallels the freeway was also closed.

Traffic updates / ODOT camera on I-5 at Wilsonville

The inmate work crew was cleaning up litter and storm debris on the side of the freeway when the accident happened just before 10:30 a.m.

The semi-truck slammed into the fence along I-5 and rolled onto its side after hitting the workers.The cause of the crash remains under investigation.

Diesel fuel also started leaking from the overturned truck and a HazMat crew was trying to contain the 25 to 50 gallon spill. Firefighters were working with the Oregon Department of Transportation to pump the remaining fuel out of the truck's tanks.

Photos: I-5 accident scene

The semi-truck had been transporting paper products.

Names have not yet been released.

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