A record number of terrorism-related cases are being opened in Germany, keeping federal prosecutors as busy as ever.

German media reported that more than 900 terrorism-related cases have been opened so far this year, including 800 related to radical Islamists. In fact, the number of terrorism-related cases has increased four-fold compared to last year.

As reported by Deutsche Welle (DW), Germany’s international broadcaster, the sharp rise has stretched manpower at the Karlsruhe-based federal prosecutor’s office. Nearly 300 terrorism cases have been transferred from federal authorities to state prosecutors.

According to a report published earlier this year in Der Spiegel, Federal Attorney General Peter Frank requested state justice ministers send prosecutors and judges to help overburdened federal courts.

Meanwhile, the Federal Criminal Police Office estimates nearly 700 people in Germany are Gefährder, or radical Islamists who represent a security risk and are capable of carrying out violent attacks.

According to DW, there is concern in security circles that German nationals who went to fight in Syria or Iraq may return home and present a threat to security.