An armed mom pulled a gun from her handbag and fatally shot a man who had pulled a gun on a group of mothers with young children who had come together for a Mother's Day celebration - and the entire incident was caught on video.
The suspect fired his weapon, a.38 caliber revolver, once into the crowd.
Pulling out her own weapon, Ms Sastre is shown shooting the offender three times.
We know first-hand that censorship against conservative news is real. Katia didn't know if he was going to shoot the children, the mums or the headteacher who was at the entrance'. He was hit in the chest and leg as he tried to fight back.
According to the Mirror, the mum of two has served as cop for 20 years.
The man was actually able to get off a shot that bounced harmlessly off the ground before he crumpled into a heap.
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On Sunday, Sastre was commended in a ceremony by Sao Paulo governor Márcio França, who applauded her "dexterity, technique and courage" in dealing with the potentially very risky situation.
The scenes unfolded as the school in Suzano held events to celebrate Mother's Day. "I just thought about defending mothers, children, my own life and my own daughter", Da Silva told Brazilian newspaper O Globo. She said: "I had to act quickly to end his aggression and prevent him from harming anyone".
Moreia later died in the hospital, according to The Sun. He also took to social media to share her heroism online.
"I went earlier to the 4th BAEP in the east of Sao Paulo to honor a very special mother: Corporal Katia Sastre".
He said: 'Katia's courage and precision saved mums and daughters at the school entrance.