Migration from the countries of northern Central America to the United States has been reduced by more than 75% since last May, US interim Secretary of Security Chad Wolf said.
Many international observers say the country -- with 60 percent poverty -- is in no shape to welcome refugees but simply signed the agreement under intense US pressure.
The UN urged countries Tuesday to take joint responsibility for caring for surging numbers of displaced people, while wealthy nations faced criticism for not shouldering their "fair share" of the burden.
The International Committee of the Red Cross (ICRC) began a meeting with police delegates from 12 Latin American countries in Guatemala on Wednesday.
Only 12 years old when she arrived from Costa Rica, Fung Feng, now 30, has made her life in America.
Authorities "agreed to propose measures for the better management of the migratory process with emphasis on vulnerable populations."
The U.S. Supreme Court's ruling on President Barack Obama's deportation relief plan is due by late June.
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