Missouri ? Federal immigration agents raided a poultry plant Tuesday morning and arrested more than 100 workers who are believed to be illegal immigrants.

Most of those arrested at the George’s processing plant in rural Butterfield were from Mexico, Guatemala, Honduras and El Salvador, said Pete Baird, an agent in charge of the Immigration and Customs Enforcement investigations office in Kansas City.

The arrests were part of a probe into identity theft and false documents, including stolen Social Security numbers, allegedly used by illegal immigrants, Baird said.

Three people pleaded guilty this year to Social Security fraud as part of the same investigation, and one person has been indicted, Baird said.