CNN reports the stabbings as fact, using the headline, "145 people pricked with syringes at France street music festival"
Ahead of the festival, feminist influencers .... warned that calls had been made on social media for women to be targeted with syringes.
The NYT suggests it might be mass psychosis triggered by the social media alerts:
the Paris prefect of police, said in an interview on the French news network CNews that the police were taking reports seriously, but also with caution. “This is not a new phenomenon,” he said. La Voix du Nord, a regional newspaper in the north of France, reported on Monday that one girl who said she had been stabbed with a needle appeared, after closer examination, to have been scratched.
...
[A founder of the Global Drug Survey] cautioned that some of the reports in France may have resulted from panic as news reports of the stabbings spread. “Until there is toxicological evidence, what the story might be is that a group of people pick up on something they heard had happened to someone else,” he said. “Because you feel a sharp prick does not mean you have been injected with a drug.”