The number of Central American children who are getting caught illegally crossing the Southwest border without their parents each day has dropped by more than half since last month, the White House announced Monday.

In June, federal immigration authorities apprehended about 355 unaccompanied children on average per day in the Rio Grande Valley. That number dropped to about 150 during the first two weeks of July and has been as low as 104.

“Since the beginning of July, we have begun to see some initial signs of progress along our southwest border, although it is too early to tell whether these trends will be sustained over time,” the White House said in a prepared statement.

As required by federal law, immigration authorities are transferring many of the children they are apprehending to the care of relatives in Georgia and other states, where they undergo deportation proceedings in nearby immigration courts like the one in Atlanta.

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