The architect of the summer's terror attacks in Barcelona had worked with Spanish intelligence agencies, according to a new report.
Abdelbaki Es Satty collaborated with the National Intelligence Centre while serving time in jail, the agency has admitted.
The NIC has said it maintained "a contact" with Satty in 2014, the final year of his four-year sentence for drug trafficking.
However the intelligence body insists this sort of relationship is common practice for security agencies and lies "within common protocols."
Several Spanish news outlets have suggested Satty worked as an informant for the NIC, however the agency itself has declined to describe his role in such terms, according to ABC.
Satty is widely credited with brainwashing the jihadists who carried out the terror attacks in Las Ramblas and Cambrils in August, in his role as the Imam of Ripoll. He died in an explosion at a property in Alcanar, believed to be a bomb-making factory, on the eve of the attacks.
A report published in the Guardian in the days after the attacks quoted Catalan officials as saying Satty had not been known to authorities.