DES MOINES, Iowa (AP) -- A second supervisor arrested after a massive immigration raid at the Agriprocessors Inc. plant in Postville has pleaded guilty to aiding and abetting the harboring of undocumented immigrants.

Martin De La Rosa-Loera appeared in federal court on Wednesday in Cedar Rapids. He was arrested in July following a raid at the kosher meatpacking plant two months earlier.

Federal officials say that 43-year-old De La Rosa-Loera assisted others in harboring illegal immigrants.

Last week, another supervisor at the plant, Juan Carlos Guerrero-Espinoza, pleaded guilty to one count of conspiracy to hire illegal immigrants and one count of aiding and abetting the hiring of illegal immigrants.

A sentencing date for De La Rosa-Loera wasn't immediately scheduled. He faces a maximum of five years in prison and a $250,000 fine.

Nearly 400 people were arrested at the Agriprocessors raid.

Agriprocessors also operates a plant near Gordon, Neb.