Messages appeared to indicate the girls planned to kill themselves after the murders took place, including one with included the phrase "thank Satan", according to police.
Two schoolgirls in Florida in the United States took knives and a pizza cutter to school with the intention of killing their classmates, cutting them up and drinking their blood before "leaving their body parts at the entrance" and killing themselves, police said.
Police said the girls claimed to be devil worshippers and were planning to slit their classmates' throats, drink their blood and eat their flesh once they had killed them.
Bartow Middle School administrators "saved" the school from the girls' freaky scheme when the duo's absence from class triggered a search.
When asked about their motives, the girls reportedly told authorities that they worship Satan. According to FOX 13, authorities discovered a hand-drawn map of the school with the words "Go to kill in the bathroom" written on it.
A search of their cell phones revealed messages indicating that they planned to "leave body parts at the entrance" before killing themselves, according to WFTV-TV.
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He added: 'I'm going to call them small children, only 11 and 12 - seriously sat down and plotted to do serious bodily harm to another student at school'. "After that, their bags were searched, and several weapons including a pizza cutter and butcher knife were found on the girls".
Yesterday at approximately 1:30pm, the Bartow Police School Resource Officer assigned to Bartow Middle School was summoned to the Principal's office in reference to an armed juvenile complaint. They meant to eat the victims' flesh, place their body parts by the school's front entrance and kill themselves once it was over, police said. The girls are close friends who live near by and had spent the weekend together, Mr Hall said.
'Killing all of these students was in hopes it would make them worse sinners ensuring that after they committed suicide.
School staff had been looking for the girls after one was reported missing from class.
Polk County school officials tweeted that extra police officers and guidance counselors would be available during the week - hopefully, for would-be "vampires", too.
It will be up to prosecutors to decide whether the girls will be charged formally as juveniles or adults, Deputy Police Chief Bryan Dorman said in an email on Wednesday.