A general view of the prison centre of Vendin-le-Vieil, northern France, where Salah Abdeslam is held, on April 10, 2025. FRANCOIS NASCIMBENI / AFP

France's anti-terror unit said Saturday, November 8, three people were in custody as part of an investigation into a suspected terror threat linked to Salah Abdeslam, the last surviving perpetrator of the devastating November 13, 2015, Paris attacks.

Abdeslam, who is incarcerated in Vendin-le-Vieil prison in northern France for his involvement in the attacks, was briefly taken into custody for questioning Tuesday as part of an investigation opened in January 2025 concerning the illicit possession of a USB memory stick in prison. France's anti-terror unit PNAT said Saturday it had "expanded" the investigation to include the offence of terrorist conspiracy aimed at preparing a crime against individuals.

Abdeslam is suspected of concealing illicit items and was again taken into custody on Friday after his initial detention on Tuesday, the prosecutor said. Another person was taken into custody on Tuesday, the prosecutor added, stating that their detention was "ongoing and has been extended beyond the initial 96 hours, by an additional duration of 24 hours."