On December 4, 2008, the U.S. Immigration and Customs Enforcement (ICE) announced the arrest of 16 Mexican nationals on administrative immigration violations at Idaho Truss, a wood framing company in Nampa, Idaho. ICE initiated this investigation after reviewing the employment records of individuals who were helping build military housing at Mountain Home Air Force Base. The investigation revealed that some of the workers may have secured employment using false Social Security numbers and other counterfeit identity documents. In recent months, ICE has dramatically increased its investigation of employers in an effort to deter illegal employment of foreign nationals in the United States. During fiscal year 2008, ICE made 5,173 administrative immigration arrests at worksites nationally. In addition, 1,101 criminal arrests were made in connection with worksite investigations.