Mysterious redness and needle punctures in party guests have caused astonishment and uncertainty in France.
For several weeks there have been victims of needlesticks in various French cities at celebrations, the police said on Saturday.
During investigations, however, no substances were found in the bodies of the attacked.
There were several investigations into the incidents.
According to the broadcaster France Info, the judiciary initiated a total of 130 investigations.
Media had previously reported of revelers who suddenly became dizzy or had a headache.
Later they would then have noticed a small wound as from a syringe.
Some would also have felt a spade.
Police advised unsettled partygoers to look out for each other and report incidents.
Those who have been attacked should go to the hospital immediately to be examined.