More Mexicans and Central Americans are lining up to make asylum requests at the U.S.-Mexico border as word spreads of a U.S. crackdown on families crossing illegally and the threat of brutal gangs lying in wait if they go it alone.

Officials at shelters in border cities as well as migrants from Mexico and Central America said there was a rising number of people waiting, often for weeks, to make asylum pleas to immigration authorities at official border crossings.

Many of the dozens of migrants interviewed said they decided to present an official asylum request after hearing about parents being separated from children when crossing the U.S. border illegally, and about friends making successful requests.