Two U.N. groups said Thursday that the number of migrants crossing the dangerous Darien Gap between Colombia and Panama could soar to as many as 400,000 this year. That would represent a huge increase from the 250,000 migrants estimated to have crossed the roadless, jungle-clad route in 2022. The U.N. agencies for refugees and migration said in a report that nearly 100,000 people may have already made the crossing so far this year, six times more than in the similar period of last year. If that trend keeps up, it could mean many more migrants seeking to reach the United States through Central America and Mexico.