KIEV - The Ukraine Security Service (SBU) and police have broken up a human-trafficking gang that brought Ukrainian women to Poland to work as prostitutes, the press-service of the SBU reported Friday.

According to its statement, three Polish and one Ukrainian have been arrested on suspicion of running the organization.

Criminals have worked in the Volyn region in the Western Ukraine. Local employee of one of the border security centers was searching and recruiting the women.

A Polish citizen sent visa invitations for the "modern slaves" and help them to cross the border.

Currently the case is under the investigation. The gang members could get from 8 to 15 years in prison.

Human trafficking is a big problem for Ukraine. Experts believe that more than 100,000 Ukrainians have been trafficked abroad and forced into indentured labor or prostitution since the disintegration of the Soviet Union.