Border Patrol agents began chasing the vehicle around noon before a Dimmit County sheriff's deputy took over the chase, just west of Big Wells, Boyd said.
Hundreds of children are waiting away from their parents inside a Border Patrol holding facility in South Texas, with groups of 20 or more children to a single cage.
Meanwhile, the US Customs and Border Patrol Agency issued a statement expressing "deepest sympathies" to the families of those who died in the crash.
Hundreds of children wait in Border Patrol facility in Texas
The pursuit took place in Big Wells, about 130 miles southwest of San Antonio.
CNN has reached out to local authorities and is waiting to learn details of the crash.
When asked why Border Patrol agents started the chase, Boyd said, "It's called good police work". The vehicle was traveling at more than 100 miles per hour when it crashed. Authorities believe the driver and one passenger are U.S. citizens.
Images from the scene appeared to show a large four-door SUV-style auto badly wrecked in the middle of the road. Multiple people from both vehicles were arrested.
Twelve immigrants were ejected and four died at the scene when the auto crashed and rolled over, according to Boyd.
He said his deputies are often involved in chases pursuing people suspected of smuggling undocumented immigrants and drugs.
Shikhar Dhawan hits a century
Rashid, who had an terrible start to Test cricket, picked up skipper Rahane's wicket and troubled the batsmen then on. Afghanistan, on the other hand, won't find the going too easy against the seasoned Indian campaigners.
Officials said four of the immigrants died in the crash, while nine others were injured. "I think we need a wall in my opinion".
"We've seen this many, many times and not only in this county but other counties along the border", he said.
Boyd said his officers have dealt with the driver before, adding he was scouting the area earlier to try and pick up immigrants.
Germany struggled to break down the El Tri defense, too often settling for crosses against a well-set defense. Germany , meanwhile, face an uphill task to become the first team to win back-to-back World Cups in 56 years.
The major specifications of OnePlus 6 listed below could compete with even the high-end smartphone releases of Samsung and Apple . These 11 countries also hosted 26 pop-up events that welcomed 15,000 guests across the world following the launch event.
And with the policy in the news, broadband providers are under scrutiny from Congress, the public and the press. This free market environment resulted in optimal innovation, economic growth, and the best value for consumers.
The Japan Meteorological Agency has updated the magnitude of the quake to 6.1, stronger than the initial 5.9 magnitude. The Osaka prefectural government reported two deaths, and an Ibaraki city official confirmed a third.
Russian Federation selected 11 host cities to be the venues for the matches of the 2018 World Cup and they are Moscow , St. Petersburg, Sochi, Kazan, Saransk, Kaliningrad, Volgograd, Rostov-on-Don, Nizhny Novgorod, Yekaterinburg and Samara.
As part of President Donald Trump's trade agenda , the United States has launched another volley of tariffs - this time on China. On Friday, the United States imposed additional tariffs of 25 per cent on import of Chinese goods worth $ 50 billion.
The Blues' defence of the Premier League title kicks off with one of the toughest of tests - a trip to Arsenal. Wenger chose to step down at the end of last season after nearly 22 years in charge of the north London club.
But here are a few tactics that have been tried before that have drawn scrutiny under the old net neutrality rules. The repeal effectively allows ISPs to block, throttle and prioritize content and internet access as they please.
They weren't the only favourite to struggle, with Brazil drawing with Switzerland while Germany lost to Mexico . With this disappointing start by the Germans, it is yet to be seen if they can match Brazil's long-held record.
Three things we learned today at the World Cup
That provided the space Argentina needed to whip in the cross that led to the penalty that was expected to be the match-winner. Within the opening 15 minutes, we got to see more chances than in probably the entirety of the game which preceded it.
Global markets higher ahead of Trump-Kim meeting
Kim Jong-un has arrived in Singapore on Sunday ahead of his historic summit with President Donald Trump. Then-South Korean President Syngman Rhee wanted to continue fighting and refused to sign the treaty.