Updated

A French judicial official says the partner of the Islamist extremist who carried out an attack last week in southern France was, like him, known to police as radicalized.

The 18-year-old woman was still being detained Monday by police for questioning in the case, as well as a 17-year-old friend of gunman Radouane Lakdim, the official said. He was speaking anonymously to discuss the ongoing investigation.

Lakdim was known to police for drug-dealing, and since 2014 had been on the so-called "Fiche S" list, a government register of individuals suspected of being radicalized but who have yet to perform acts of terrorism.

Four people were killed in a carjacking and the supermarket attack Friday near the city of Carcassonne.

Lakdim was killed by police who stormed the supermarket.