US detained nearly 1m migrants in 12 months

US border agents arrested or stopped nearly one million undocumented migrants at the southern border with Mexico in the last 12 months, the most in more than a decade, a top official said Tuesday. The surge came amid President Donald Trump's tough efforts to halt illegal immigration, which began to show results only in the last three months, when border arrests plummeted. The surge came mainly from Central American migrants fleeing poverty and violence, crossing in large groups and family units into the US from Mexico and turning themselves in to ask for asylum.