PHOENIX — Police confirmed that a pocket knife was used in the deadly attack of a Maryvale High School student . Questions remain about how the weapon made its way through the school's security system onto the campus.

Michael Montoya II, 16, was killed in the attack, and a teen suspect is in custody.

12News reached out to the Phoenix Union High School District to ask about the district’s new advanced weapon detection system and how a possible prohibited item could potentially get through.

The school district said that the investigation into what happened at Maryvale High School is ongoing, and no new details could be released at this time.

According to the district’s website, the system uses "cutting-edge technology to identify potential threats and assist in preventing incidents bef

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