Some of the migrants jumped back into the river and swam back to Mexico while the agents apprehended about 19 of their fellow travelers, according to information provided to Breitbart Texas by Rio Grande Valley Sector Border Patrol officials.
A Border Patrol agent was arrested early Saturday after allegedly killing four women - believed to have been prostitutes - and kidnapping a fifth, officials say.
"It's interesting that he would be observing and watching as law enforcement was looking for the killer, that he would be reporting to work every day like normal", Alaniz said.
Juan Davis Ortiz, 35, a former US Navy vet, who has been with the US Border Patrol for 10 years was captured by the state troopers on Saturday in Laredo, a Texas city on the border with Mexico.
"Apparently the suspect pulled out a gun on her and she was able to escape", Webb County Sheriff Martin Cueller said. It's also not clear exactly when and where the crimes took place.
Alaniz said authorities plan to file four murder charges and one charge of aggravated kidnapping against Ortiz. Two of the victims were found earlier this month along Interstate 35 in rural northwest Webb County, the Laredo Morning Times reports.
According to The Morning Times, investigators found the body of 29-year-old mother-of-two Melissa Ramirez of Laredo on September 4, along a remote stretch of Texas Route 255.
All of these cases are related to the almost two week murder investigation of two other women who were found killed in a rural part of Webb County.
The sheriff's office said all four bodies have been found, and no other victims are expected.
Police say he confessed to four killings, but refrain from revealing details of the attacks.
Andrew Meehan, a spokesman for Customs and Border Protection, said the government is fully cooperating with local Texas authorities.
"I extend my condolences to the families of the victims during this hard time".
Authorities planned to provide another update on the investigation on Monday.