One of two Austrian teenage girls who flew to Syria in April to join Islamic State fighters is believed to have been killed, The Daily Mail reported on Monday.
Samra Kesinovic, 16, and her friend Sabina Selimovic, 15, disappeared from their Vienna homes earlier this year.
Soon afterwards they began posting images of themselves holding Kalashnikov rifles, surrounded by armed men - photos which Austrian authorities feared were acting as militant recruitment posters for young girls.
The Austrian government has not yet confirmed which one of the teenagers has been killed.
Alexander Marakovits, spokesperson for the Interior Ministry, told The Salzburger News: 'We also have this information and have checked it, but cannot say with absolute certainty that it is true.
'But the parents have been informed their daughter could be dead.'
What motivated the two Bosnian girls is unclear, but before leaving, they were in contact with Chechen youths and visited a mosque in Vienna's second district.
Police expressed concerns last week that the pair were inspiring their peers after two other teenage girls were caught attempting to flee the country to join ISIS ranks.
Austrian media warned several weeks ago that the two girls had become the poster children for the call to jihad.
The fears appeared to be validated, with the Austrian Interior Ministry confirming two other girls from Vienna had attempted to flee the country to participate in the holy war.
Little information was given about the latest pair attempting to join the Islamic State aside from the fact that one was 16 and the other was 14 and their parents were apparently from Iraq.
Police now want to figure out how they became radicalized, and whether anybody had helped them plan their trip to Syria, which was allegedly set to take place via Turkey - following the same route as the other two girls.
It's not known whether the group was in contact with Samra and Selimovic, who - despite the fact they are being hunted by Interpol - have remained on the run.
