KSAT
Now playing
01:55
Border patrol chase ends in deadly crash
Now playing
03:03
Border patrol detains citizen for not answering question
ana suda interview don lemon on border patrol agent
CNN
ana suda interview don lemon on border patrol agent
Now playing
02:27
US citizen asked for ID after speaking in Spanish
CNN
Now playing
02:09
Panel erupts over Border Patrol agent protocol
immigrant families separated border fact check tapper orig_00014318.jpg
immigrant families separated border fact check tapper orig_00014318.jpg
Now playing
02:21
Border officials change account of shooting
CNN
Now playing
01:09
Trump orders National Guard troops to border
Texas FBI Press Conference
CNN
Texas FBI Press Conference
Now playing
02:04
FBI details Border Patrol agents' injuries
Border patrol agent funeral Rogelio Martinez
US Customs and Border Patrol
Border patrol agent funeral Rogelio Martinez
Now playing
03:41
Questions remain after border agent death
Border Patrol agents patrol the US-Mexico border prior to an Easter mass at the fence separating the two countries at Friendship Park in San Ysidro, California on Sunday, April 16, 2017.    / AFP PHOTO / Sandy Huffaker        (Photo credit should read SANDY HUFFAKER/AFP/Getty Images)
SANDY HUFFAKER/AFP/Getty Images
Border Patrol agents patrol the US-Mexico border prior to an Easter mass at the fence separating the two countries at Friendship Park in San Ysidro, California on Sunday, April 16, 2017. / AFP PHOTO / Sandy Huffaker (Photo credit should read SANDY HUFFAKER/AFP/Getty Images)
Now playing
02:13
Few details released in border agent's death
tx border patrol agent killed dnt_00001313.jpg
tx border patrol agent killed dnt_00001313.jpg
Now playing
01:33
Border Patrol agent killed in southwest Texas
Speaker Ryan
Now playing
01:40
Paul Ryan releases border wall video
State The Green San Diego
State The Green San Diego
Now playing
04:46
Why Border Patrol agents have the highest suicide rate
exp weed hidden in limes CNNTV _00002001.jpg
exp weed hidden in limes CNNTV _00002001.jpg
Now playing
00:48
Border patrol finds weed camouflaged as limes
new us border patrol agents dnt_00001808.jpg
KGBT
new us border patrol agents dnt_00001808.jpg
Now playing
01:52
150 agents deployed to Texas border
national border patrol muesum origwx GR_00000612.jpg
national border patrol muesum origwx GR_00000612.jpg
Now playing
02:16
A tour of the National Border Patrol Museum
ac dnt griffin high cost of border drones_00004819.jpg
ac dnt griffin high cost of border drones_00004819.jpg
Now playing
05:18
Border patrol drones 'invaluable' or 'wasted money'?
CNN —  

A vehicle packed with undocumented immigrants flipped Sunday, ejecting 12 people and killing at least five after a chase in south Texas, Dimmit County Sheriff Marion Boyd said.

Four people were killed at the scene about 50 miles from the Mexico border and a fifth person died at a hospital in San Antonio, the sheriff said.

Dimmit County Sheriff Marion Boyd
KSAT
Dimmit County Sheriff Marion Boyd

The incident started after a Border Patrol agent in Carrizo Springs suspected smuggling when he saw a trio of vehicles pass him on a rural highway around 11 a.m., US Customs and Border Protection said. The agent stopped one vehicle and radioed a description of the other vehicles to other agents, the agency said.

A second agent stopped the second vehicle and several people were arrested from those two vehicles, but the third vehicle didn’t stop when an agent tried to pull it over, Customs and Border Protection said.

A Dimmitt County Sheriff’s deputy took over the chase just west of Big Wells, but the vehicle, which was traveling around 100 mph, lost control, ran off the roadway before flipping several times, landing on the highway, according to Boyd.

“We’ve seen this many, many times, in not only this county but other counties along the border,” Boyd said. “It’s a problem. … This is, I think, a perfect example of why our borders need to be secure.”

’We need a wall’

Boyd said there were 14 people in the vehicle that flipped. Authorities believe the driver and one passenger are US citizens.

Local law enforcement officers were familiar with the driver, who was in the area last week to either pick up undocumented immigrants or to scout, the sheriff said.

The other 12 passengers were undocumented immigrants, Boyd said.

Boyd said the victims were taken to hospitals. Six patients were taken to San Antonio Military Medical Center in San Antonio, Lt. Edwin Roberts said. He would not confirm if any of the patients had died.

The sheriff said he didn’t know where the immigrants were from but said most migrants who travel through the area are from Central America or Mexico.

He said his deputies are often involved in chases pursuing people suspected of smuggling undocumented immigrants and drugs.

“I think we need a wall, in my opinion,” he said, voicing support for President Donald Trump’s proposal to construct a border wall with Mexico.

Boyd added: “If it can be built, I think it needs to be built. But along with that, there needs to be cameras. There needs to be sensors.”

03:06 - Source: CNN
Fact Check: Construction on a new border wall?

Footage from a motorist who witnessed the crash and posted video to Facebook shortly after shows at least four bodies on the highway, the mangled Chevrolet and several Border Patrol vehicles at the scene.

Yolanda Choates, a US Customs and Border Protection spokeswoman, directed questions to the sheriff’s office.

When asked why Border Patrol agents started the chase, Boyd said, “It’s called good police work.”

CNN’s Amir Vera contributed to this report.