"As agents responded, they observed hundreds of people consisting of family units and unaccompanied children cross the [Rio Grande] river levee," the release said.
The 289 people formed the largest group of migrants found crossing the Rio Grande River Valley in the state of Texas so far this year, the release said.
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In all, Rio Grande Valley Sector Border Patrol arrested over 1,000 migrants within the last 24 hours, bringing the sector total to 14,000 thus far in February.
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