Matthew Klein, assistant commissioner at the CBP, said that after learning of the "disturbing social media activity", the agency immediately informed the Department of Homeland Security's Office of the Inspector General and initiated an investigation.
The row erupted as immigration officials said they would investigate a secret Facebook group of more than 9,000 current or former immigration agents.
In that group, they could reportedly be seen posting jokes about migrant deaths and vulgar comments about Latina lawmakers.
The discovery of the page, called "The Real CBP Nation", followed a ProPublica investigation that revealed the existence of a secret Facebook group that featured sexist and xenophobic posts about migrants who died crossing into the country or while in U.S. custody.
"Joaquin Castro said he ignored requests to relinquish his phone to record video of detained migrants at border facility " was first published by The Texas Tribune, a nonprofit, nonpartisan media organization that informs Texans - and engages with them - about public policy, politics, government and statewide issues.
The union said that lisp speak in the "I'm 10-15" Facebook neighborhood is no longer advisor of its workers and "does a colossal disservice to all Border Patrol agents, the overwhelming majority of whom extinguish their duties honorably".
For example, a news story about a 16-year-old Guatemalan who died in Border Patrol custody elicited comments such as "Oh well" and "If he dies, he dies".
Representative Alexandria Ocasio-Cortez, who visited the detention centers in Texas with other members of Congress on Monday, described conditions as "horrifying" and said migrants were being subjected to "systemic cruelty". "Officers were preserving ladies folks in cells w/ no water & had told them to drink out of the toilets". She also showed children's drawings showing people held in cages.
A delegation of politicians from the Congressional Hispanic Caucus were touring the facilities following reports from a government watchdog that immigrants were being housed in overcrowded and unsanitary conditions. "Congresswoman Ocasio-Cortez", explained Kennedy, "someone needs to tell her that the voices in her head are not real".
A report publicly released Tuesday details a nightmare scenario for immigrants who are caught attempting to enter the US through Texas.
The inspector general's report says the opportunity for personal hygiene is scarce and many migrants became ill and constipated from the diet of bologna sandwiches that they are given.
She also said any employees found to be a part of the group will be held accountable.
The Texas visit came the same day as Trump signed a $4.6 billion emergency aid package that Congress passed on Friday.
A second official, according to the Examiner, said Ocasio-Cortez shared information with her group that she had learned from detainees, including the claim that one person had drunk from a toilet.
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