LAS VEGAS -- Police say they’ve arrested a 15-year-old student accused of plotting a shooting at his Las Vegas high school.

Clark County School District Police captain Ken Young said Thursday the student at Desert Oasis High School was taken into custody Thursday after police uncovered an alleged plot for a mass shooting in the near future or “something more catastrophic” at the school of about 2,350.

Several students who heard about the alleged plot came forward, along with a parent in Arizona who listened in to a Skype conversation their child was having that mentioned the high school, Young said.

Get Breaking News Delivered to Your Inbox

Police interviewed the student suspect and went to his home, where they recovered evidence that’s currently being analyzed. Sources told CBS affiliate KLAS that investigators discovered a “manifesto.” Young wouldn’t detail what items were found.

Young thanked the students and the parents who called police. He said the plot was uncovered “in part thanks to a parent being nosy, thanks to a parent paying attention, thanks to a parent who did not sit on information and brought that information forward.”

Investigators believe the student was working alone, and didn’t have a “vendetta” against any particular student at the school, Young said. He’s been charged with making terroristic threats.