(CNN)US Customs and Border Protection encountered 171,700 migrants in March, including a record number of unaccompanied minors, far exceeding the prior month’s totals and continuing an upward trend dating back to last year, according to preliminary data obtained by CNN.

The data underscores the ongoing challenge facing the Biden administration as officials scramble to set up emergency sites to house migrant children, many of whom have been held in poor conditions.More on Immigration

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In March, CBP encountered 18,800 unaccompanied children at the border, according to the preliminary data, nearly doubling the number apprehensions of children in February and setting a record high. In May 2019, the highest month of arrests during that year’s crisis, CBP arrested 11,861 unaccompanied children at the US southern border.Single adults still make up the majority of border apprehensions, with 99,300 encountered in March, the preliminary data reveals, up from 71,598 in February. Single adults are largely being turned away at the US southern border as soon as they’re encountered under a public health order, and as a result, the figure might also account for repeat crossers.More migrant families are also arriving. In March, around 53,500 families were encountered by border officials, up from 19,246 in February. Some families are being swiftly expelled, while others are being released in the US as a result of limited capacity in Mexico.Read MoreCNN reached out to CBP for comment. New video shows conditions inside border facilityNew video shows conditions inside border facilityNew video shows conditions inside border facilityJUST WATCHEDNew video shows conditions inside border facilityReplayMore Videos …MUST WATCH

New video shows conditions inside border facility 02:29The White House’s coordinator of the southern border, Amb. Roberta Jacobson, acknowledged the high number of arrivals this week, saying that they will eventually decline. “Yes, it’s a larger group than usual, but … they will also diminish at a certain point. And the thing we have to do most quickly is get humanitarian assistance, job training, education, feeding assistance — because there’s food insecurity throughout these countries. We need to provide options,” she said. Projections reviewed by CNN this week indicate that encounters are expected to continue rising through September, though estimates could be subject to change in the event of policy modifications or other changes in Latin America. Efforts to care for minorsThe accelerated pace of arrivals has overwhelmed border facilities as officials race to transfer children to the custody of the Department of Health and Human Services, which is charged with the care of migrant children. Government data released Thursday indicates some level of progress, as the number of children in Border Patrol facilities, akin to jail-like conditions, gradually declines.As of Wednesday, there were 4,966 children in CBP custody and 13,204 children in HHS custody, that data shows. More than 800 children had been transferred out of CBP custody. A day prior, there had been 5,285 children in CBP custody and 12,918 children in HHS custody. Kamala Harris dives into migration diplomacy as GOP aims to make her the face of the border crisisKamala Harris dives into migration diplomacy as GOP aims to make her the face of the border crisisKamala Harris dives into migration diplomacy as GOP aims to make her the face of the border crisisOver recent days, HHS has opened, and announced, a string of sites intended to accommodate unaccompanied migrant children, while case managers help relocate them with a sponsor, like a parent or relative, in the United States. On Wednesday, HHS said it would open its 10th temporary housing facility for unaccompanied migrant children at a site in Houston.The Office of Refugee Resettlement, a federal agency under HHS, has also deployed staff to initiate the process of reuniting unaccompanied children with family in the United States. “By going to the border, ORR can begin the unification process even before a child is referred to ORR’s care, thereby reducing hours, if not days, off of the time it takes to find and unify a child with their family member or suitable sponsor,” the agency said in a statement.

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