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Secret service agents fear hordes of Islamic extremists are waiting to strike in Bosnia – which lies between Italy, Austria and Greece.

Croatian agents say the number of jihads in the country has rapidly increased following the return of prison lags from Iraq and Syria.

They add inmates have often returned home after serving short prison sentences during which they were further radicalised.

Officials say the internet is also to blame for the extremists groups in the country – who advocate ISIS – being able to land more recruits.

Security experts add this marks the a rise in Islamic extremism in Europe with Croatian President Kolinda Grabar-Kitarovic among leaders concerned by the trend.

It is believed the blood-thirsty terror-mongers are living north-west of the nation on the border with Croatia, clustered around the town of Velika Kladusa and city of Bihac.

Further reports suggest children living among these groups are forbidden to listen to music or watch TV and instead forced to follow strict religious rules.

Daily Star Online previously reported how footage had captured more than 100 bombs, troves of suicide belts and weapons left behind after more than 200 ISIS terrorists were killed.

The footage released by the Russian Defence Ministry shows a massive network of underground tunnels used by terrorists to stock weapons, ammunition and as living quarters.

It also emerged that the death cult is using women to fight on its front lines.