A federal judge demanded Friday that U.S. immigration officials disclose the whereabouts of 265 people arrested in a meatpacking raid last month in Colorado.

U.S. District Judge John L. Kane gave Immigration and Customs Enforcement until Jan. 22 to submit a list accounting for all the detainees, including those who have been deported.

"There are people in custody — there is an urgency to this," Kane said.

Monitor the disorder on the border at FOXNews.com's Immigration Center.

Union attorneys are contesting the arrests at the Swift & Co. meat processing plant in Greeley, one of six Swift plants in six states that were raided Dec. 13. In all, 1,282 people were arrested on immigration violations during the raid, and about 220 of those also face criminal charges such as identity theft.

Most of the 265 people charged in Greeley faced immigration charges.

The United Food and Commercial Workers Union filed suit in Denver federal court, alleging the arrests violated the workers' constitutional rights to due process. ICE has denied the charge.

In addition to Greeley, Swift plants were raided in Grand Island, Neb.; Cactus, Texas; Hyrum, Utah; Marshalltown, Iowa; and Worthington, Minn.

The Denver lawsuit did not include workers arrested at those plants.