A rollover crash north of Ferndale in Whatcom County caused a two-mile back-up on Sunday afternoon.
Troopers say two vehicles were traveling northbound when one possibly had a tire blow. It sideswiped the other vehicle, then rolled and landed on its tires on the shoulder of southbound I-5.
The sideswiped vehicle ended up on the left lane of northbound I-5.
Two passengers that were in the vehicle that rolled were taken to a hospital with unknown injuries