A suspicious white powder found Thursday afternoon at a business in Harlan caused authorities to block-off roads in the vicinity of CDS Global. Shelby County Emergency Management officials told the Omaha World-Herald the powder was reported at around 1:45-p.m. Federal and State Authorities were investigating the incident and conducting tests on the substance late Thursday night.Harlan police, deputies with the Shelby County Sheriff’s Office, crews with Harlan Fire Department and Shelby County Public Health officials assisted at the scene.