NASHVILLE, Tenn. (WKRN) – The Metro Nashville Police Department issued an update Monday afternoon on its findings regarding The Covenant School shooting.

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Metro police reported Audrey Hale fired a total of 152 rounds —126 rifle rounds and 26 nine millimeter rounds — throughout the 14 minutes until Hale was shot and killed by two officers.

Officer Rex Englebert shot a total of four rounds from his rifle while Officer Michael Collazo fired four rounds from his nine millimeter pistol, police said.

According to Metro police, Hale acted totally alone based on information currently available.

Police also said collective writings written by Hale found in a Honda Fit left in the school parking lot, and others found in the bedroom of the family home, showed Hale documented planning to commit mass murder at The Covenant School over a period of months. Hale also considered “the actions of other mass murderers.”

Police said the writings remain under careful review by the MNPD and the FBI’s Behavioral Analysis Unit in Quantico, Virginia.

Investigators still have not determined a motive for the shooting. That part of the investigation remains ongoing by the Homicide Unit in consultation with the FBI’s Behavioral Analysis Unit.

Also on Monday, newly obtained search warrants revealed what investigators seized from the home of Hale.

Inside the home, officers found two shotguns, one in a bedroom closet and another next to a desk in a bedroom. Investigators also took 30 journals, some with references to school shootings and firearms courses.

A suicide note was also found, as well as, five Covenant School yearbooks.

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The search warrants also revealed that Hale had turned 28 three days prior to the shooting. The warrants were sworn after Hale was identified with facial recognition software provided by agents with the Bureau of Alcohol, Tobacco, Firearms and Explosives.