JACKSON, Miss. (AP) Dozens of immigrant workers have been released a day after being detained in the largest immigration raid in a decade in the United States.

Immigrations and Customs Enforcement officials say 680 people were arrested in Wednesday's raids.

But immigration lawyers say that by Thursday morning, about five busloads of people had been released.

28 PHOTOS Life inside California's largest immigration detention center See Gallery Life inside California's largest immigration detention center ICE detainees are seen at the Adelanto immigration detention center, which is run by the Geo Group Inc (GEO.N), in Adelanto, California, U.S., April 13, 2017. REUTERS/Lucy Nicholson SEARCH "ICE NICHOLSON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. A meal is seen in a cell for incoming ICE detainees at the Adelanto immigration detention center, which is run by the Geo Group Inc (GEO.N), in Adelanto, California, U.S., April 13, 2017. REUTERS/Lucy Nicholson SEARCH "ICE NICHOLSON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. Detainees exercise in a recreation area at the Adelanto immigration detention center, which is run by the Geo Group Inc (GEO.N), in Adelanto, California, U.S., April 13, 2017. REUTERS/Lucy Nicholson SEARCH "ICE NICHOLSON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. Men play dominoes at the Adelanto immigration detention center, which is run by the Geo Group Inc (GEO.N), in Adelanto, California, U.S., April 13, 2017. REUTERS/Lucy Nicholson SEARCH "ICE NICHOLSON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. Detainees exercise in a recreation area at the Adelanto immigration detention center, which is run by the Geo Group Inc (GEO.N), in Adelanto, California, U.S., April 13, 2017. REUTERS/Lucy Nicholson SEARCH "ICE NICHOLSON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY Men share a pair of headphones to watch television in a dormitory at the Adelanto immigration detention center, which is run by the Geo Group Inc (GEO.N), in Adelanto, California, U.S., April 13, 2017. REUTERS/Lucy Nicholson SEARCH "ICE NICHOLSON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. Female detainees read about a hunger strike at the Tacoma immigration detention center as they sit in a dormitory at the Adelanto immigration detention center, which is run by the Geo Group Inc (GEO.N), in Adelanto, California, U.S., April 13, 2017. REUTERS/Lucy Nicholson SEARCH "ICE NICHOLSON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. A communal area is seen at the Adelanto immigration detention center, which is run by the Geo Group Inc (GEO.N), in Adelanto, California, U.S., April 13, 2017. REUTERS/Lucy Nicholson SEARCH "ICE NICHOLSON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. A communal area is seen at the Adelanto immigration detention center, which is run by the Geo Group Inc (GEO.N), in Adelanto, California, U.S., April 13, 2017. REUTERS/Lucy Nicholson SEARCH "ICE NICHOLSON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. A razor wire fence surrounds the Adelanto immigration detention center, which is run by the Geo Group Inc (GEO.N), in Adelanto, California, U.S., April 13, 2017. REUTERS/Lucy Nicholson SEARCH "ICE NICHOLSON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. A girl waits with visitors in the lobby of the Adelanto immigration detention center, which is run by the Geo Group Inc (GEO.N), in Adelanto, California, U.S., April 13, 2017. REUTERS/Lucy Nicholson SEARCH "ICE NICHOLSON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. A woman lies on a bed in a dormitory at the Adelanto immigration detention center, which is run by the Geo Group Inc (GEO.N), in Adelanto, California, U.S., April 13, 2017. REUTERS/Lucy Nicholson SEARCH "ICE NICHOLSON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. ICE detainees walk into the dining area for lunch at the Adelanto immigration detention center, which is run by the Geo Group Inc (GEO.N), in Adelanto, California, U.S., April 13, 2017. REUTERS/Lucy Nicholson SEARCH "ICE NICHOLSON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. ICE detainees make phone calls at the Adelanto immigration detention center, which is run by the Geo Group Inc (GEO.N), in Adelanto, California, U.S., April 13, 2017. REUTERS/Lucy Nicholson SEARCH "ICE NICHOLSON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. A world map is seen on the wall of the visiting area at the Adelanto immigration detention center, which is run by the Geo Group Inc (GEO.N), in Adelanto, California, U.S., April 13, 2017. REUTERS/Lucy Nicholson SEARCH "ICE NICHOLSON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. The high-risk detainee visiting area is seen at the Adelanto immigration detention center, which is run by the Geo Group Inc (GEO.N), in Adelanto, California, U.S., April 13, 2017. REUTERS/Lucy Nicholson SEARCH "ICE NICHOLSON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. David A. Marin, Field Office Director, Enforcement and Removal Operations, stands at the entrance to the Adelanto immigration detention center, which is run by the Geo Group Inc (GEO.N), in Adelanto, California, U.S., April 13, 2017. REUTERS/Lucy Nicholson SEARCH "ICE NICHOLSON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. ICE detainee possessions are seen in the intake area at the Adelanto immigration detention center, which is run by the Geo Group Inc (GEO.N), in Adelanto, California, U.S., April 13, 2017. REUTERS/Lucy Nicholson SEARCH "ICE NICHOLSON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. Immigrants sit in a cell for incoming ICE detainees at the Adelanto immigration detention center, which is run by the Geo Group Inc (GEO.N), in Adelanto, California, U.S., April 13, 2017. REUTERS/Lucy Nicholson SEARCH "ICE NICHOLSON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. An immigrant takes food into a cell for incoming ICE detainees at the Adelanto immigration detention center, which is run by the Geo Group Inc (GEO.N), in Adelanto, California, U.S., April 13, 2017. REUTERS/Lucy Nicholson SEARCH "ICE NICHOLSON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY Handcuffs for employees to use are seen at the entrance of the Adelanto immigration detention center, which is run by the Geo Group Inc (GEO.N), in Adelanto, California, U.S., April 13, 2017. REUTERS/Lucy Nicholson SEARCH "ICE NICHOLSON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. Salvadoran immigrant Roberto Galan, 33, poses for a photo at the Adelanto immigration detention center, which is run by the Geo Group Inc (GEO.N), in Adelanto, California, U.S., April 13, 2017. REUTERS/Lucy Nicholson SEARCH "ICE NICHOLSON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. An ICE detainee rests his hands on the window of his cell in the segregation wing at the Adelanto immigration detention center, which is run by the Geo Group Inc (GEO.N), in Adelanto, California, U.S., April 13, 2017. REUTERS/Lucy Nicholson SEARCH "ICE NICHOLSON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. A woman lies on a bed in a dormitory at the Adelanto immigration detention center, which is run by the Geo Group Inc (GEO.N), in Adelanto, California, U.S., April 13, 2017. REUTERS/Lucy Nicholson SEARCH "ICE NICHOLSON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. The women's medical room is seen at the Adelanto immigration detention center, which is run by the Geo Group Inc (GEO.N), in Adelanto, California, U.S., April 13, 2017. REUTERS/Lucy Nicholson SEARCH "ICE NICHOLSON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. Possessions lie on a bed in a women's dormitory at the Adelanto immigration detention center, which is run by the Geo Group Inc (GEO.N), in Adelanto, California, U.S., April 13, 2017. REUTERS/Lucy Nicholson SEARCH "ICE NICHOLSON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. An ICE detainee lies in his cell in the segregation wing at the Adelanto immigration detention center, which is run by the Geo Group Inc (GEO.N), in Adelanto, California, U.S., April 13, 2017. REUTERS/Lucy Nicholson SEARCH "ICE NICHOLSON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY Women stand in a dormitory at the Adelanto immigration detention center, which is run by the Geo Group Inc (GEO.N), in Adelanto, California, U.S., April 13, 2017. REUTERS/Lucy Nicholson SEARCH "ICE NICHOLSON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. Up Next See Gallery Discover More Like This HIDE CAPTION SHOW CAPTION of SEE ALL BACK TO SLIDE

The terms of the workers' releases were unclear. It also was unclear whether any of those released were determined to be living in the country legally. ICE officials did not return telephone calls Thursday morning.

Officials had said Wednesday that they would release detainees who met certain conditions, such as pregnant women or those who hadn't faced immigration proceedings previously.

Karla Vazquez-Elmore is a lawyer representing arrested workers. She said even those not arrested are terrified.

More from :

A Detroit man dies in Iraq after being deported in Trump's immigration enforcement efforts

ACLU: 911 children split at border since 2018 court order

Senators who visited border ask DHS to improve migrant care