"It was Border Patrol agents' effort and valued partnership with the Honduran Consulate in Los Angeles that helped us identify a risky convicted felon moving amongst the migrant caravan", said San Diego Sector Chief Patrol Agent Rodney Scott.
The migrants had crossed the U.S. -Mexico border illegally during a chaotic clash with Border Patrol agents near Tijuana Mexico.
The mayor of Tijuana added that whoever organized this migrant caravan needs to be held accountable and face criminal charges.
A group of asylum seekers camping out at the U.S. -Mexico border have started a hunger strike to protest Mexico's efforts to block them from making their way to U.S. The protest group is part of a caravan of thousands of Central American asylum seekers who have waited for weeks in the Mexican border town of Tijuana to process their asylum claims.
The memo was circulated amid reports that US President Donald Trump has told aides he has considered replacing Nielsen and other officials in his Cabinet, frustrated with Nielsen's lack of progress on immigration and border enforcement. Homeland Security Secretary Kirstjen Nielsen said in a tweet after the Sunday clash that the actions by the migrants were "dangerous and not consistent with peacefully seeking asylum".
"On Nov. 24th, around 11 P.M., agents detected three people crossing the border illegally approximately one-mile east of the San Ysidro port of entry".More news: Apple falls after Trump suggests iPhones could get hit by tariffs
Meanwhile, several migrants swam around or climbed over the border barrier overnight and were detained by US officials.
They appeared to easily pass through the Mexican police blockade without using violence. That prompted Border Patrol agents to launch tear gas and pepper spray balls to quell the unrest.
Many others were not referred to the Justice Department because they were children or parents accompanying children, the official said.
US authorities are working on a new system to better record evidence if similar circumstances arise, the official said.
Migrants would be allowed to stay - many who hope to cross don't want to move far away from the border - but they will have to find their own food, Magallanes said.