Agents from U.S. Immigration and Customs Enforcement entered the Agriprocessors Inc. complex in northeast Iowa Monday morning to execute a criminal search warrant for evidence relating to aggravated identity theft, fraudulent use of Social Security numbers and other crimes, said Tim Counts, a Midwest ICE spokesman.

Agents are also executing a civil search warrant for people illegally in the United States, he said.

Immigration officials told aides to Rep. Bruce Braley, D-Iowa, that they expect 600 to 700 arrests. About 1,000 to 1,050 people work at the plant, according to Iowa Workforce Development, the state's employment services agency.

Chuck Larson, a truck driver for Agriprocessing, was in the plant when the agents arrived. "There has to be 100 of them," he said of the agents.

Larson said the agents told workers to stay in place then separated them by asking those with identification to stand to the right and those with other papers, to stand to the left.

"There was plenty of hollering," Larson said. "You couldn't go anywhere."

When asked who was separated, Larson said those standing in the group with other papers were all Hispanic.

ICE spokesman Harold Ort in Postville did not confirm or deny that anyone had been detained, but went on to say that the children of those detained would be cared for and that "their caregiver situation will be addressed."

"They were asked multiple times if they have any sole-caregiver issues or any childcare issues," Ort said.

Aides to Braley said they have been told that "hundreds" of arrests are expected because the action is more of an "investigation" than an immigration raid, and specific individuals are being targeted for arrest as part of the investigation.

Counts described the events in Postville as a "single site operation." He said he was not aware of any other immigration raids being conducted elsewhere Monday.

Postville Police Chief Michael Halse said he did not know anything about the raid until Monday morning.

Postville is a community of more than 2,500 people that includes natives of German and Norwegian heritage and newcomers who include Hasidic Jews from New York, plus immigrants from Mexico, Russian, Ukraine and many other countries.

The Agriprocessors plant, known as the nation's largest kosher slaughterhouse, is northeast Iowa's largest employer.

About 200 Hasidic Jews arrived in Postville in 1987, when butcher Aaron Rubashkin of Brooklyn's Crown Heights neighborhood reopened a defunct meat-packing plant with his two sons, Sholom and Heshy, just outside the city limits. Business boomed at the plant, reviving the depressed economy while pitting the newcomers against the predominantly Lutheran community.

Former Iowa Gov. Tom Vilsack said that the Postville immigration investigations were warranted despite concerns that federal official violated the constitutional rights of people in past raids.

"Remember our concern has not been about whether or not there should be raids," Vilsack said. "It's the way the raids have been conducted and the way in which American citizens' rights have been violated by virtue of sort of a roundup process that's used and what we think are inappropriate and unconstitutional actions on the part of immigration officials."

Vilsack and others have alleged that immigration officials used humiliation, opposite-sex searches and long periods of secrecy in the Dec. 12, 2006, raids at Swift & Co. in Marshalltown, Iowa, where 90 people were arrested on immigration charges.

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Contributing: Jane Norman, The Des Moines Register

CEDAR RAPIDS, Iowa - Federal immigration agents raided a northeastern Iowa meat processing plant Monday, arresting more than 300 people and housing many of them at a converted fairgrounds. The raid of the Agriprocessors Inc. plant in Postville was the largest in state history and had been planned for months, said U.S. Attorney Matt M. Dummermuth.

The raid, one of several conducted at meat-processing plants around the country in recent years, was aimed at seeking evidence of identity theft, stolen Social Security numbers and people who are in the country illegally, ICE spokesman Tim Counts said.

Authorities arrived at the Agriprocessors plant about 10 a.m. and presented company officials with search warrants. Agents asked to speak with all the employees, and plant officials cooperated and shut down their operations.

Agriprocessors, the world's largest kosher meatpacking plant, did not immediately return messages seeking comment.

Of those arrested, 44 were released for humanitarian reasons, primarily because they must care for children. They were ordered to report to court later.

Others arrested were held in local jails or driven by bus about 75 miles to temporary housing at the National Cattle Congress fairgrounds in Waterloo. Federal authorities previously leased the fairgrounds and have turned it into a secure center.

Sister Mary McCauley, a Roman Catholic nun at St. Bridget's Catholic Church in Postville, said family members of plant workers came to the nearby church in tears after immigration agents arrived in buses, vans and two helicopters.

"The people right now are hearing and seeing the helicopters," McCauley said Monday morning. "They are just panic-stricken and very frightened and some of them are coming to the church as a safe haven."

McCauley said she went to the plant to help provide information and assist workers but was not allowed to get close.

"Some of the people that are going to be detained are up against a fence and now they're tying their hands," she said.

Many of the plant workers are Hispanic, mostly from Mexico and Guatemala, she said.

Counts, the ICE spokesman, said a toll-free telephone number had been set up to assist family members of those arrested who have questions about their detention status and the removal process.

Asked about the raid during a Monday news conference, Gov. Chet Culver said both illegal immigrants and companies that knowingly hire them should be prosecuted.

"Illegal means illegal, not just those who are crossing the border illegally but those who are responsible for helping to make it happen," Culver said. He added that it is also important to consider humanitarian concerns and had raised those issue with immigration authorities.

The governor said he'd been told last week there would be some kind of federal action.

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Associated Press writers Michael Crumb, Mike Glover and David Pitt in Des Moines, Iowa, contributed to this report.