( CNN ) Authorities detained a 15-year-old girl from Cape Town , South Africa , at the city 's airport after receiving information she was leaving the country to join ISIS , State Security Minister David Mahlobo said . `` We are still conducting further investigation . The girl over the past period has been using technology on social media platforms interacting with strange people and reading material that suggested she expressed an interest in joining a terrorist group called ISIS , '' he told broadcaster eNCA . Police and airport security located the girl on a Johannesburg-bound flight , and `` we got our agencies to secure all the important exit points in the country . We got her at Cape Town International Airport , '' Mahlobo said . Virginia teen accused of being ISIS recruiter . It 's not clear how the girl was recruited or how the airfare was arranged , he said . Officials debriefed the girl 's family and released her into the family 's care , Mahlobo said . `` The recruitment and radicalization of particularly young people to take part in acts of terror is a growing global concern and local law enforcement agencies will continue to work hard in clamping these from materializing , '' the minister said in a statement Monday . Australia teens suspected of trying to join ISIS stopped at airport .
Official : Girl , 15 , `` expressed an interest in joining a terrorist group called ISIS '' Authorities detain girl at Cape Town International Airport airport , release her into family 's care , he says .