French authorities detain 12 people after 145 revelers across the nation reported being in pricked with syringes during the Fete de la Musique national music festival.

French police have detained 12 suspects after 145 people reported being pricked with syringes during the country’s annual street music festival, officials said Sunday.

Millions of people took to the streets across France on Saturday evening for the Fete de la Musique, with authorities reporting “unprecedented crowds” in Paris.

Before the party, posts on social media had called for women to be targeted during the festivities.