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Scores of migrants from Central America have set up an encampment on the border between Tijuana, Mexico, and San Diego, waiting to apply for asylum in the United States after a journey that has drawn international attention. American border authorities have thus far declined to process the asylum seekers, a stalemate with no clear end.

For several years, migrants from Central America have made their way north en masse in so-called caravans as a way to protect themselves from criminals as they flee violence in their home countries. This year, more than 1,200 migrants joined the caravan, which formed in late March in southern Mexico. It has drawn intense scrutiny among conservatives and in right-wing media, and President Trump himself warned on Twitter that the caravan posed a threat to the United States’ security.

With the American authorities unwilling to let the migrants enter the country on Monday, upward of 150 migrants from the caravan who intended to seek asylum huddled with donated blankets and sandwiches, which were distributed by volunteers. Plastic tarps protected them from the intense sun, and small knapsacks held their few belongings.

The group has vowed to stay until the asylum seekers are allowed to petition for protection on American soil.