"It was Border Patrol agents' effort and valued partnership with the Honduran Consulate in Los Angeles that helped us identify a unsafe convicted felon moving amongst the migrant caravan", said San Diego Sector Chief Patrol Agent Rodney Scott.
Officials with Mexico's human rights commission said the new facility opened on Thursday is bigger than the sports complex, which can handle only about 2,000 people, and will ensure migrants are not forced to sleep out in the open.
During an immigration interview, Ramirez reportedly told the San Diego Sector Border Patrol agents that he was part of the migrant caravan originating in Honduras-making stops in Guatemala and Mexico before his capture in southern California.
Administration officials have portrayed the caravan as a lawless, violent mob, saying there are some 600 people in the group who have a criminal history.
After calling the migrant caravan a "humanitarian crisis", Mayor Juan Manuel Gastélum said he can not continue to fund the shelters for migrants without federal support.
Tough stance on caravan keeps criminals in Mexico
"Those are the real criminals because they're dealing with the lives of people", he added, referencing the organizer's behind the caravan whom he believes should face criminal charges.
"You want to get up and get out of there really quickly", Bayron, 27, of Honduras, who declined to give his last name, said.
Meanwhile, Secretary of Defense James Mattis said this week US troops deployed to the border may stay longer than previously expected.
Irineo Mujica, who has accompanied the migrants for weeks as part of the aid group Pueblo Sin Fronteras, said the aim of Sunday's march toward the USA border was to make the migrants' plight more visible to the governments of Mexico and the U.S. All three men are being held in DHS custody pending deportation proceedings.
Top members of Obrador's cabinet plan to travel to Washington on Sunday to finalize an agreement which would mandate asylum seekers to remain in Mexico while their claims are processed by the United States authorities, the Washington Post reported. The group was detained by U.S. Border Patrol agents as soon as they stepped onto U.S. territory.