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By Bernd Debusmann Jr
BBC News, Washington
A new video from the US-Mexico border appears to show Texas National Guard members ignoring desperate pleas from a migrant woman in the Rio Grande river.
A woman and child appeared in danger of drowning in the river along the Texas-Mexico border in the 12 December video.
Texas National Guard members seemed to ignore the woman's cries for help.
The BBC has contacted Customs and Border Patrol (CBP), the Texas Military Department and the Texas Department of Public Safety for comment.
In the video, taken near the town of Eagle Pass, Texas, the woman in the water can be heard telling members of the Texas National Guard in a nearby boat that she "can't walk anymore".
"I'm begging you, please help me. I really can't anymore," she can be heard saying in Spanish, with the cries of the child clearly audible. "Please don't abandon me here."
The video has circulated as migrant crossings and detentions on the US southern border have spiked this year - nearly 9,000 migrants were apprehended on Monday alone.
Priscilla Lugo, a Texas-based advocacy director for LatinoJustice PRLDEF, a civil rights organisation, recorded the video. At the time, she was on a canoe trip to observe the impact of Texas' border security operations.
"It was clear she was already in some sort of need," Ms Lugo told the BBC . "She was begging for help. I was perpetually worried for her since the moment I heard her."
In the video, a Customs and Border Patrol (CBP) airboat can be seen moving through the river nearby.
Ms Lugo said that she believed that CBP - which is usually tasked with water rescues in the area - was coming to help the woman and child, who she estimated was three or four years old.
"They got very, very close to her... but zoomed past her and the baby," she recounted. "At that point, we don't hear the mom or the baby crying anymore. We don't really see them. They go under water."
Several minutes later, Ms Lugo said that she saw that the woman had dragged herself to the riverbank on the Mexican side.
"It was a scary few moments until we saw her come out," she added.
The incident took place several hundred metres from controversial border buoys that have been the subject of intense legal wrangling.
The League of United Latin American Citizens - one of the largest Latino civil rights organisations in the US - demanded a federal investigation into a "callous disregard for human life".
Lydia, Guzman, the group's national immigration chair, said in a statement that it was "beyond belief" that guardsmen would ignore a woman and child at risk of drowning.
"I am shocked and saddened beyond words," she said.
The video's emergence comes as officials face a significant migrant increase at the US southern border, particularly in Texas and Arizona. Daily migrant detentions are as high as 10,000 in December, compared to about 6,000 in October.
Earlier this week, acting CBP Commissioner Troy Miller told CBS, the BBC's US partner, that the migrant crossings are presenting a "serious challenge".
Texas Governor Abbott announced Operation Lone Star in March 2021. The state-run border strategy included new riverbank fortifications and the floating buoys on the Rio Grande.
Texas officials claim the plan has stopped nearly 490,000 migrants and led to the arrest of 37,300 criminals.
It has, however, faced intense criticism from the federal government and the White House, in part, over concerns that migrants are being mistreated.
Ms Lugo said she believes the video illustrates wider issues stemming from an operation that is "touted as a public safety measure".
"What's really happening here is that public safety becomes letting a mother and small child potentially drown because they need to deter migration," Ms Lugo said. "That's a horrific way to view public safety."