A so-called incel showed off an assault rifle on camera before allegedly killing two female teachers at his high school.
The disturbing clip showed the 15-year-old standing in front of a mirror while wearing black clothes and gloves.
He holds up the automatic rifle to the mirror before lowering it to show it in more detail.
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The suspect uploaded the clip to Instagram at around 2am, seven hours before he allegedly used the 5.56 calibre rifle to kill the teachers.
He also shared two other posts where he reportedly identified as an incel and warned of his intention to harm women.
The teen is quoted as saying: “I have decided to send the feminists, who have always ruined my life, to their creator.”
In another post, he shared a video showing notorious serial killer Charles Manson dancing.
His Instagram page has since been deleted.
The teen reportedly wore the same clothes in the attack as in the video, as reported by Need To Know.
The alleged shooting took place at around 9am on Tuesday (24 Mar).
The teen entered the grounds of the Anton Makarenko private high school in the city of Lázaro Cárdenas, Mexico, and allegedly opened fire on the victims.
It is believed the attack occurred after a previous row with the teachers over arriving late to school.
The victims have been identified as Tatiana Madrigal Bedolla, 37, and María del Rosario Sagrero Chávez, 36.
A school spokesperson said: “The pain we are experiencing today as an institution is very deep.
“We are overcome with dismay, helplessness, and a sadness that we share with each of their family members, friends, colleagues, and loved ones.”
Students also expressed their sorrow on social media, remembering the teachers’ dedication to their profession with fondness.
After the shooting, the police managed to track down the teen, named only as Omar, and seized the suspected murder weapon.
The case remains under investigation.
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