Police say the initial investigation shows a semi with a livestock trailer lost control on the exit ramp and rolled over on its side, which resulted in the release of around 40 head of cattle.

ARLINGTON, Texas (CBSDFW.COM) - An early morning crash on July 18 led to massive traffic delays after a semi-truck slammed into a livestock trailer hauling 90+ head of cattle. CBS 11 News ...

Sigworth says the trailer tipped around 6:40 a.m., but they are still investigating possible reasons why. There were no injuries reported, and the condition of the pigs inside is unknown.