HAVANA (AP) — Cuban authorities have arrested 17 people in connection with what they described as a network to recruit Cuban nationals to fight for Russia in Ukraine.

The head of criminal investigations for Cuba’s Interior Ministry, César Rodríguez, said late Thursday on state media that at least three of the 17 arrested are part of recruitment efforts inside the island country.

He did not identify the alleged members of the network but said they had previous criminal records. Some families started speaking up about the case on Friday, and at least one mother said that her son was promised a job in construction in Russia.

Cuba’s Foreign Ministry said on Monday that the government had detected a network operating from Russia to recruit Cuban citizens living both in Russia and in Cuba to fight in Ukraine. It said authorities were working “to neutralize and dismantle” the network but gave no details.