Immigration, Prince Philip, U.F.O.s: Your Weekend Briefing Here’s what you need to know about the week’s top stories. April 11, 2021 crush of young migrants arriving at the border. The flow is only expected to increase in coming weeks. The numbers are daunting. More than 20,000 children and teenagers are in the custody of a government system that is already overstretched. In March, border agents encountered nearly 19,000 children at the border — the largest number recorded in a single month — most of them fleeing poverty and violence in Central America. Above, La Joya, Texas, last month. By June, there could be more than 35,000 migrant children in need of care, according to government projections obtained by The Times — a prospect that one former senior official in the Department of Health and Human Services called “terrifying.”