U.S. President Barack Obama on Wednesday renewed America's commitment to the recovery and reconstruction of earthquake-devastated Haiti, telling visiting President Rene Preval he knows the crisis in his country has not passed.

After an Oval Office meeting, Obama stood beside Preval in the White House Rose Garden to praise the Haitian leader's courage and the heroic work of Americans who rushed to help as rescue workers or with generous donations.

Obama said the challenge now is "to prevent a second disaster" with the start of the rainy season in a country where masses of people are without shelter.

"The situation on the ground remains dire," Obama said, "and people should be under no illusion that the crisis is over."

More than 230,000 people perished in the Jan. 12 earthquake. Obama called it an "international tragedy" and said he was proud the United States has played a leading role in relief efforts.

Moving forward, Obama told Preval, Washington will remain a partner with Haiti on the long road to recovery and reconstruction.

Preval stood erect as he listened to Obama, responding with words of gratitude. "I thank you not only for the material support but the moral support, the psychological support that made us know we were not alone," the Haitian leader said.

At the same time, he said, rebuilding must take place in a way that benefits the entire country, not just the most devastated areas.

He said spreading "health care, education and jobs for all men and women" across his country would prevent "migratory flows to the big cities" which produced the sprawling and poorly built slums of the capital, Port-au-Prince.