Nearly 1,000 families remain separated as a result of the Trump administration policy that split up undocumented immigrants and their children at the Mexican border, the Department of Homeland Security said Thursday.

The update came on the second anniversary of President Joe Biden creating the Family Reunification Task Force. 

According to the DHS, the task force has identified 3,924 children who were separated from their families from Jan. 20, 2017, to Jan. 20, 2021. As of Feb. 1, 2,926 have been reunited with their families — more than 600 of those since Biden took office.

Of the 998 children who remain separated, 148 are in the process of being reunited while another 183 families have been notified by a contracted nongovernmental organization about the opportunity for reunification, the DHS said.

“Today we recognize the dedication of those who have helped reunite these families, and we reaffirm our commitment to work relentlessly to reunite the other families who suffered because of the prior cruel and inhumane policy – a policy that did not reflect the values of our nation,” Homeland Security Secretary Alejandro Mayorkas said in a statement. 

“We remain steadfast in our commitment to fulfill President Biden’s pledge to reunify all children who were separated from their families under the ‘zero-tolerance’ policy to the greatest extent possible, and we continue to work diligently to incorporate the foundational principle of family unity in our policies and operations,” Mayorkas added.

The number of separated families has continued to grow because more families have come forward, the DHS said.

During the Trump administration’s “zero-tolerance” policy, the Justice Department began to prosecute all migrants suspected of illegally crossing the border. Those who arrived with children were separated from their kids, who were placed initially in DHS detention centers, then transferred to the Department of Health and Human Services and later sent throughout the country to live with foster families or relatives.

The policy sparked strong backlash both in the United States and around the world, especially because the administration struggled to track the children. Under pressure, Trump abandoned the policy in June 2019. Soon after, a federal judge blocked the practice and ordered the government to reunite the children with their families. 

The task force has been working with NGOs and international partners to conduct outreach and support separated families, the DHS said. Families who register online for reunification services are connected with support services through the International Organization for Migration and receive support in applying for humanitarian parole, arranging travel to the U.S. and accessing behavioral health services after arriving.