A auto chase between border patrol vehicles and an SUV carrying 14 people resulted in a auto crash in Big Wells, Texas on Sunday.
Four people were killed at the scene and a fifth person died at a hospital in San Antonio, the sheriff said.
This article be updated as more details become available.
Boyd said the vehicle was going more than 100 miles per hour before the crash.
Boyd said such an incident was "not unusual at all", adding that his deputies are involved in high-speed pursuits related to human smuggling or drug trafficking on a daily basis. One person died upon arriving at the hospital, he said.
He added: 'This is a ideal example of why our borders need to be secure'.
In all, 14 people were inside the SUV, including the driver and passenger, according to the sheriff. Officials said they believe the driver and passenger are both US citizens. The Trump administration has said tougher immigration policies - even separating children from their parents - are needed to deter immigrants from coming to the country illegally.
This SUV was packed with undocumented immigrants as it crashed trying to escape border patrol.
CNN reports they reached out to Yolanda Choates, a spokeswoman for US Customs and Border Protection, but she directed all comments back to the sheriff's department. He credited "good police work" for the reason deputies started pursuing the vehicle.