"X-files... i want to believe".
Get yourself a healthy dose of skepticism young man!
You cannot believe everything you read on the internet. Here, read this, then google the text to confirm provenance.
"Molins said in a press conference that Mostefai had an "S" file on him for years, which means investigators believe he had been "radicalized" in some way, though it was not clear whether he would act on his radicalization."