Two people are in critical condition after a semi-truck accident on eastbound Interstate-40 early Friday morning. Ponderosa Fire crews were called to milepost 180, near Parks at around 2:44 a.m. and found a semi-truck off the side of the road with two people stuck inside. Crews had to tear the roof off the cab of the truck to get them out. They were transported to Flagstaff Medical Center in critical condition. No other vehicles were reportedly involved in the accident. Crews will be cleaning up the scene through Friday. If you are traveling in the area, use caution.