Mexico City, Mexico - Mexico's President Enrique Pena Nieto and Central American leaders hailed US President Barack Obama's sweeping immigration reforms on Friday, with the Mexican leader calling them the "most important measures taken in several decades."

Obama's plan, unveiled on Thursday, eases the threat of deportation for some 4.7 million immigrants who are in the United States without legal documents.

"This is an act of justice which recognizes the great contribution of millions of Mexicans to the development of our neighbor," Pena Nieto told a news conference in Mexico on Friday.

Most of the 11 million undocumented immigrants in the United States come from Mexico and Central America.

Leaders across Central America were also quick to praise Obama's plan. But they urged US lawmakers to approve a deeper reform to give lasting security to the millions of undocumented people in the United States.

"This temporary relief is a great step in the right direction from the United States to resolve the migratory issues of 11 million people, and so we urge Congress to permanently resolve their status by approving a deep immigration reform," the office of Honduran President Juan Hernandez said in a statement on Friday.

More than a million Hondurans live in the US, most of them illegally, the statement said, and the Obama plan "sends a powerful message of solidarity with Latin America."

Guatemalan President Otto Perez also applauded the plan, saying it would benefit roughly 100,000 Guatemalans in the United States.

Nonetheless, Perez urged Guatemalans not to fall for misinformation spread by people smugglers or "coyotes." Rumors of a US amnesty for mothers and children helped drive a surge in unaccompanied minors arriving from Central America at the US border last summer, sparking a political crisis in the United States.

Honduras' Hernandez and Guatemala's Perez have said both countries will need billions of dollars in US aid and investment to stem the tide of migrants heading north.

In September, Central American leaders presented a plan to boost economic growth in the region and cut illegal immigration to the United States. But the plan hinged on major spending on infrastructure and energy projects in the impoverished region.

El Salvador's Foreign Minister Hugo Martinez also saw Obama's immigration rule changes as a positive step, but vowed to keep up pressure for a more permanent solution.

The Salvadoran government also said it is preparing an information campaign warning its citizens about migrating in hopes of qualifying under Obama's orders.

"We are informing people that this is a transitional measure that only benefits those Salvadorans who arrived in the United States prior to December 31, 2009. Any others won't qualify under this measure," said Liduvina Magarin, El Salvador's assistant minister for Salvadorans abroad.