An Austrian teenager, labelled the “poster girl for Islamic State”, has reportedly been beaten to death after she was caught trying to flee Syria.

Sabra Kesinovic, 17, was allegedly murdered while trying to escape Raqqa, Islamic State’s de facto capital in Syria, two Austrian newspapers reported.

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According to The Telegraph, Ms Kesinovic appeared throughout propaganda material for IS.

Kesinovic, 17, has reportedly been killed.

She initially travelled to Syria with her friend Sabina Selimovic, 16. 

The two teens have reportedly been seen posing with rifles, while wearing Islamic headbands and being surrounded by male jihadists.

The Austrian government would not comment on the reports from the newspapers.

Last year, reports emerged that Selimovic died fighting in Syria.

An unnamed Tunisian woman who claimed to have lived with the pair was quoted in the reports saying Kesinovic was dead.

Kesonovic and Selimovic, from Austria, were both children of Bosnian refugees who fled to Syria during the country’s war in the 1990s.

Both reportedly married IS extremists once in Syria, but then Kesonovic wrote home in late 2014 saying she wanted to escape.

The pair left unannounced in 2014, leaving only a short note for their families.

It reportedly read: “Don’t look for us. We will serve Allah and we will die for him.”

Authorities accused a Bosnian Islamic preacher living in Vienna of recruiting the women.

The man, named only as Mirsad O under Austrian privacy laws, denied the allegations.