Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. 300 Migrants Released on Humanitarian Grounds After Mississippi Raids Aline Barros Hundreds of immigrant workers detained in Mississippi were released Thursday, a day after federal agents arrested 680 undocumented migrants in raids on food-processing plants,the largest such operation in the United States in 10 years. At a news conference, officials from U.S. Immigration and Customs Enforcement's Homeland Security Investigations and the U.S. Attorney's Office for the Southern District of Mississippi said more than 300 people,including pregnant women and juveniles, had been released on humanitarian grounds. Those released on their own recognizance were served with noticesand at some point will have to appear beforeimmigration judges.Others were transported to detention facilities in Louisiana and Mississippi. Nearly all of the 680 migrants picked up were from Latin America. According to officials, the operation, which had been in the planning stage for about a year, was executed when a judge agreed that law enforcement officers had "sufficient probable cause" to get search warrants and execute them. .