More than 4,200 unaccompanied children were in Border Patrol custody as of Sunday afternoon, NBC News reported on Tuesday, forcing children to stay in border facilities longer than the legal limit.

Of the 4,276 unaccompanied minors held, 2,943 had been in custody for longer than the 72-hour maximum, the network reported, with the average stay being 117 hours.

For comparison, as of last Monday there were slightly more than 3,200 unaccompanied minors in Border Patrol custody, which was a record number, NBC reported.

On Saturday alone, Border Patrol encountered 517 unaccompanied minors crossing the border, the network reported. The seven day average for single day encounters was 565, which is more than the average 313 unaccompanied minors encountered last month.

More than 2,600 of the children in custody have been fully processed by Border Patrol officials, ABC News reported, but they are still waiting to be moved from Health and Human Services facilities, which are in place to shelter minors.

Overcrowding, measured in pre-pandemic levels, has also spiked, according to ABC News.

In a statement to The Hill on Tuesday, Customs and Border Protection said DHS has continued our close coordination with HHS as it increases its capacity to care for unaccompanied minors and place them with sponsors. Our goal is to ensure that CBP has the continued capability to quickly and efficiently transfer unaccompanied minors after they are apprehended to HHS custody, as is required by U.S. law, and as is clearly in the best interest of the children.

Addressing the flow of unaccompanied children crossing our southwest border is an important priority of this Administration and DHS,” it stated. “It requires a whole of government coordinated and sustained response.

The surge in crossings prompted the Department of Homeland Security on Saturday to direct the Federal Emergency Management Agency to the border to support a 90-day effort to receive, shelter and transfer unaccompanied minors who cross the border.

I am grateful for the exceptional talent and responsiveness of the FEMA team, DHS Secretary Alejandro MayorkasAlejandro MayorkasGOP visits border, criticizes Biden policiesBorder crisis threatens Biden’s political momentumFeds to use Dallas convention center to house 3,000 migrant childrenMORE said in a statement. Our goal is to ensure that unaccompanied children are transferred to HHS as quickly as possible, consistent with legal requirements and in the best interest of the children.

The increase in numbers has become a growing concern for lawmakers on Capitol Hill. On Sunday, Speaker Nancy PelosiNancy PelosiThe Hill’s Morning Report – Presented by Facebook – Split screen: Biden sells stimulus; GOP highlights borderSpecial election a bellwether for Texas DemocratsGOP visits border, criticizes Biden policiesMORE (D-Calif.) called the unaccompanied children crossing the border a humanitarian challenge to all of us, adding that the Biden administration inherited a broken system at the border, and they are working to correct that in the childrens interest.

On Monday, top House Republicans, led by House Minority Leader Kevin McCarthyKevin McCarthyThe Hill’s Morning Report – Presented by Facebook – Split screen: Biden sells stimulus; GOP highlights borderRNC to shadow Biden as he promotes COVID-19 relief billThe Memo: Border surge collides with Biden immigration pushMORE (R-Calif.), visited the border in El Paso, Texas, and criticized President BidenJoe BidenThe Hill’s Morning Report – Presented by Facebook – Split screen: Biden sells stimulus; GOP highlights borderRNC to shadow Biden as he promotes COVID-19 relief billDems’ momentum hits quagmire over infrastructure plansMOREs immigration policies. McCarthy blamed the influx in border crossings and apprehensions on the presidents actions on immigration, and his decision to stop the construction of former President TrumpDonald TrumpThe Hill’s Morning Report – Presented by Facebook – Split screen: Biden sells stimulus; GOP highlights borderDemocrats move smaller immigration bills while eyeing broad overhaulSocial media platforms on the right fail to maintain post-Jan. 6 growthMOREs border wall.