Police say the two escaped horses may have been scared of the nearby sounds of traffic. The horses dashed into the middle of Interstate 2. An oncoming vehicle struck the first horse and a separate vehicle hit the second horse, according to The Monitor.
A third vehicle approached and crashed into the first horse, causing the vehicle to lose control and flip onto its side. Three people had to be extricated from the third vehicle. They received treatment for unknown injuries at McAllen area hospitals.
Another person in one of the other two vehicles received treatment at a local hospital via airlift, according to The Monitor.
The following information is provided by the Federal Highway Administration (FHWA):