Authorities in Lyon County in central Kansas are investigating the cause of a 12-vehicle accident that occurred on Wednesday afternoon.

Police say the crash occurred around 3:15pm on US-56 near the intersection with Road P or about 16 miles northwest of Emporia. Emergency crews arrived on the scene to find multiple vehicles involved, two of which were on fire. A North Lyon County School bus was also involved. Three juveniles were taken to nearby hospitals, one with serious injuries. A total of five people received injuries in the accident.

Police believe the crash was actually two separate accidents that were both caused by low visibility due to smoke from a nearby grass fire.