The first bout of violence happened around 1:20 p.m. Tuesday inside the Stephen T. Mather Building Arts & Craftmanship School in Hell's Kitchen.
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Police delivered scanners on Wednesday morning to ensure student safety after officials say a 17-year-old was slashed in the chest and a 15-year-old was slashed in the face.
They made cross complaints against each other to police and both are charged with assault.
One went to an urgent care for treatment and the other was taken to the hospital.
The Department of Education released the following statement on Tuesday:
"The safety and well-being of our students is our top priority. Violence has absolutely no place in our schools, and this behavior is unacceptable. Our outstanding school staff and NYPD School Safety Agents immediately responded to an incident between students at the school, and the school was placed under a soft lockdown, which has now been lifted."
Just 10 minutes later in the Williamsbridge section of the Bronx, there was a slashing at Evander Childs Educational Campus on East Gun Hill Road.
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Authorities say a 16-year-old is believed to have slashed a 15-year-old in the neck. The Department of Education says the 15-year-old suffered a "superficial injury."
The older teen was taken into custody and faces second-degree assault charges.
Officials say this was a gang-related attack.
"Our outstanding school staff and NYPD School Safety Agents immediately responded to an incident between students at the school," the Department of Education said.
A little over an hour after this attack, an 18-year-old was stabbed twice outside Queens High School of Teaching, Liberal Arts and the Sciences on Commonwealth Boulevard in Queens.
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Authorities say the victim was stabbed once in the arm and once in the torso. He was taken to the hospital with non-life-threatening injuries.
No arrests have been made in that stabbing.
The Hell's Kitchen high school where the first attack occurred does not have scanners in place, but likely will Wednesday after the slashing.
The Department of Education says it will provide additional emotional support to any student who needs it.
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