James Fredrick

The move follows protests on Sunday, when U.S. agents in San Diego sprayed tear gas at migrants said to be throwing rocks. Thousands of Central Americans are waiting to cross into the U.S.

U.S. Customs and Border Protection closed the port of entry at San Ysidro on Sunday. The move came just hours after President Trump tweeted, "No crossings!"

Angel and Delma Muñoz fled gang violence in Honduras and joined the migrant caravan headed toward the U.S. They're now among thousands waiting in Tijuana to apply for asylum.

Thousands of Central American migrants who have traveled weeks to get to the U.S. border are in Tijuana facing an uncertain future. Mexicans there resent them and the asylum process could take months.

While some residents of the northern Mexican city have said "all migrants are welcome," a group of protesters this weekend demanded they be kicked out.

Some 2,500 migrants belonging to the Central American caravan are in a government shelter in Tijuana. Another 2,000 members are on their way to the city while smaller groups are headed north.

Central Americans moving across Mexico are arriving at the Tijuana border crossing into the U.S. Their arrival increases pressures on local authorities and tensions with residents.

More than 5,000 migrants have made it to Mexico City, where authorities are providing food, health care and tents. The migrants now must decide whether to press on or accept a deal and stay in Mexico.

At a rest stop in Mexico City, adults are treated for respiratory and stomach bugs. Their feet are in bad shape. There's anxiety and fear among adults and children. But ... definitely no smallpox.

The migrant caravan moving north through Mexico comprises of thousands of people. But each person making the trek has a story and a reason for making the journey. This is just one of those stories.