The Paris prosecutor says investigators are unsure of the true identity of the man who tried to attack a Paris police station with a butcher knife and a fake explosives vest.

Francois Molins told France-Inter radio Friday that the assailant shot dead on Thursday, the anniversary of the Charlie Hebdo attacks, carried a paper marked with the Muslim declaration of faith, an emblem of the Islamic State group, his name, and gave his nationality as Tunisian. Molins said he also had a phone with a German SIM card.

Stopped for a minor theft in 2013 in France's south, the man had identified himself as Ali Sallah and gave his nationality as Moroccan.

Islamic State has claimed responsibility for the January 2015 attacks and the Nov. 13 attacks in Paris.