Spain is latest nation with reports of mysterious needle pricks at nightclubs: "A serious act of violence against women"

Police in Spain are investigating about 50 reported cases of women getting pricked with medical needles while at nightclubs or parties, a trend that previously came to the attention of authorities in other European countries.

So far, Spanish police have not confirmed any cases of sexual assault or robbery related to the mysterious jabs. Police said that 23 of the recently reported needle attacks were in northeast Spain's Catalonia region, which borders France.

Waves of needle pricks at nightclubs and musical events also have confounded authorities in France, Britain, Belgium and the Netherlands. French police have tallied over 400 reports in recent months, and said the motive of the jabs was unclear. In many cases, it also wasn't clear if the victims were injected with a substance.