Counter-terrorism police have launched an investigation into a Sydney mother-of-two who has reportedly flown to the Middle East to join Islamic State.

It is feared Jasmina Milovanov, 26, left her home in Sydney's west earlier this month to fly to Syria, leaving behind her two young children, aged seven and five.

Mahmoud Abdullatif left Melbourne late last year for Syria but now is believed to be dead.

Do you know more? Email us, message us on Twitter @smh.

Ms Milovanov is Facebook friends with former Melbourne woman and jihadi bride recruiter Zehra Duman, whose ­­husband, former Melbourne man Mahmoud Abdullatif, is believed to have been killed fighting with the Islamic State earlier this year.