DULUTH - An undercover prostitution operation has nabbed five people in Duluth.Police say Brandon LaFave, 23, and Frankie Curtis, 36, are charged with solicitation of prostitution in a public place.Three women were also arrested and charged with prostitution. Their names were not released by police Friday because the women are part of an "ongoing investigation," according to Duluth police.The undercover operation targeted suspects who are using the escort section on Backpage.com to advertise illegal services.