Three of the five arrested this week in connection with the attack in Strasbourg are being investigated for violations of the terrorist law, according to sources in French courts.
According to French media, French police suspect the three to have provided the revolver Cherif Chekatt used during the attack where five people were killed. The source in the judiciary in Paris does not confirm this specific information, but says the people are formally investigated for violations of the arms law and for having entered into a terrorist federation.
Chekatt was shot and killed by police on December 13 after a two-day police operation. The 29-year-old had an extensive record of offenses that were not terror-related and was known to the authorities as an extremist.
After the attack, investigators found a video in which Chekatt swore allegiance to IS, claiming to be behind the attack on the Christmas market in the French city.
Two other people arrested along with the three terrorist suspects on Tuesday were released without charge.