Like other European countries, Spain has stepped up efforts to prevent citizens being radicalised and recruited to Islamist groups in Syria or Iraq since the attacks on the satirical newspaper Charlie Hebdo in Paris last month.
Two of those were arrested in the Spanish North African enclave Melilla and ran web pages promoting the cause of various groups, especially Islamic State, translating material into Spanish, ministry said in a statement.
"Both those arrested, who shared the strategy of the terrorist group DAESH (the Islamic State), recruited women who, after a process of indoctrination, ended up joining the terrorist group," it said.