The German government Wednesday denied security flaws at its domestic spy service after an agent was unmasked as a suspected Islamist and media labelled him a former gay porn actor.

The interior ministry rejected calls for a procedural overhaul at Germany's internal security watchdog, the Office for the Protection of the Constitution (BfV), where the 51-year-old had worked.

"We currently have no indication that there are fundamental structural problems," said a ministry spokesman, noting that the BfV itself had helped expose what he called an isolated case.

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