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Santa Cruz High School is closed on Wednesday as the Santa Cruz Police Department and FBI agents investigate the threat of a mass shooting.According to Deputy Police Chief Steve Clark, the principal received an email last night threatening that a mass shooting would happen at the school on Wednesday. As of 7 p.m. Wednesday, officials had not made a decision on whether Santa Cruz High would be open for classes on Thursday. Clark said student safety is the number No. 1 priority. Someone sent the email to Principal Karen Edmonds at 8:43 p.m. Tuesday, and Clark said it came from a "server using sophisticated encryption."Edmonds called police two minutes later."We want to know who sent this, and where it was sent from, to determine the seriousness of their intentions," Clark said.PHOTOS: Santa Cruz High School closed because of threat"Some of these masking email services are becoming more sophisticated. We are going to use every resource we have to identify the person responsible for this," Clark said. While working throughout Tuesday night, the superintendent and police decided the best course of action for student safety was to close the school. A reverse 911 call and campus safety alert email were sent out to students and parents at 6 a.m. Santa Cruz City Schools district held a press conference at 1 p.m. to release additional information.Superintendent Kris Munro said no specific students were named in the email. The email said the entire student body and some staff members would be targeted. "The email indicated an intention to create a mass casualty situation with students and staff at the campus. This wasn't like a manifesto list of individuals. To protect the integrity of the investigation, we are not releasing the specific content of the email," Clark said.The email mentioned specific weapons and locations.No other principals in the district received email threats, Munro said.A meeting for parents will be held at Kaiser Permanente Arena at 7 p.m. Wednesday. VIDEO: Santa Cruz High students, officials react to threatSanta Cruz police are encouraging anyone with information to call their investigators at 831-420-5820, or send an anonymous tip by calling the tip line at 831-420-5995.Check back with KSBW.com for updates on this developing story.