Federal immigration agents arrest a man in the parking lot of an H-Mart grocery store on October 31, in Niles, Illinois. Jamie Kelter Davis/Getty Images

In the latest judicial blow to President Donald Trump’s push to detain and deport undocumented immigrants en masse, a judge ruled Wednesday hundreds of people arrested in an Illinois immigration operation must be released.

The detained people must be granted bond by the end of next week, the judge ruled, but big questions remain about how the process will play out – including locating those arrested, some of whom have been moved across the country, plaintiffs say.

Here’s what we know – and what we don’t know about what happens next.

What did the judge decide?

US District Judge Jeffrey Cummings, who was nominated by former US Pre

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