Germany’s Interior Ministry said Sunday that over 100 members of the so-called “Islamic State” (IS) terrorist group have returned to the country following the jihadi networks failed incursions in Iraq and Syria.

“Security authorities obtained knowledge that they actively engaged in combat in Syria and Iraq or have completed apprenticeships to this end,” the ministry told the DPA news agency ad quoted by the Deutsche Welle. “These people remain under police and judicial investigation.”

The ministry added that the number of open investigations is in the “two-figure range.”

Authorities believe that 1,060 IS fighters left Germany for Syria or Iraq, of which a third have since returned, the Interior Ministry said.