(CNN) -- They went missing in broad daylight -- forced into a van at gunpoint. Eleven young people, one only 16 years old, just vanished from Mexico City's popular Zona Rosa entertainment district. That's what their relatives say as they pressure officials to do more to help them.

It's a mystery that's hit hard in Mexico City, a metropolis considered relatively safe from the violence that torments other areas.
But police say there is just no evidence that anything actually happened.
Not all of the 11 people said to be involved knew each other, but most of them hail from the Tepito neighborhood, a place known for its rough character. That alone has added spice to an already sensational story, leading to speculation of whether gangs could be somehow involved.

Right now, there's so very little to go on -- little but very different accounts from relatives and officials.

Relatives ask for information about what happened to their loved ones.
The youths were taken from the Heavens After nightclub on Sunday, May 26, between 10 a.m. and noon, family members say. They were forced into a van and kidnapped, they claim.
Investigators, however, say they've turned up nothing. No sign of forced entry into the nightclub. No fingerprints from the missing people on any of the bottles or glasses at the bar that would indicate they were even there.

"In the case of the armed group, we don't have that confirmed," Mexico City Attorney General Rodolfo Rios said. As for a suspicious van, several were seen in the area at the time, he said, but did not elaborate.
What police did find were two computers, a USB memory stick, 12 psychotropic pills and 42 grams of marijuana. They have not said what connection, if any, any of these have to the missing.

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