This booking photo of Julie Schnecker, 50, who was arrested...

This booking photo of Julie Schnecker, 50, who was arrested on Jan. 28, was provided by the Hillsborough, Fla., County Jail. (Jan. 30, 2011) Credit: AP

Police say the Tampa mom accused of killing her teenage son and daughter wrote a note before the shootings in which she referred to her plan as a “massacre.”

Authorities say Julie Powers Schenecker bought a .38-caliber revolver the weekend before the shootings. Tampa Police spokeswoman Laura McElroy told the St. Petersburg Times the mother also noted that the three-day waiting period to take a gun home would “delay the massacre.”

Police have said Schenecker  shot her children, Calyx, 16, and Beau, 13, for being “mouthy.” She is charged with first-degree murder but her arraignment has not yet been scheduled.

Her husband, Army Col. Parker Schenecker, is in Fort Worth, Texas, for Tuesday’s funeral for the children.

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