Interstate-40 was closed Sunday afternoon after an accident involving two semi-trucks started a brush fire east of Flagstaff. DPS officials say the accident happened just after 4 p.m. on eastbound I-40 about five miles east of Twin Arrows Casino. One of the semis was parked in the emergency lane and was side-swiped by another commercial vehicle, which caught on fire and spilled its contents of produce onto the interstate. The fire spread, so both east and westbound lanes were closed while crews put out the fire. There were injuries involved in the collision. There’s no word on what caused the accident. The incident is under investigation.