Madison, Wisconsin, police are looking into a possible manifesto or letter written by the 15-year-old female shooter who killed a classmate and a teacher and wounded several others before turning the gun on herself at Abundant Life Christian School (ALCS) on Monday morning. Police revealed the identity of the shooter, who will not be named per Daily Wire policy, during a Monday night press conference. The teen girl used a handgun that police recovered from the scene and was found dead from an apparent self-inflicted gunshot wound. Madison Police Chief Shon Barnes told CNN on Tuesday that authorities “have been made aware of a manifesto … or some type of letter that’s been posted by someone who alleged to be her friend.” “We haven’t been able to locate that person yet, but that’s something we’re going to work on today,” Barnes added. Social media posts have circulated claiming to reveal what the shooter wrote before the fatal shootings, but so far, police have not confirmed the authenticity of any alleged manifesto. The police chief also addressed unsubstantiated claims that have spread on social media claiming that the shooter identified as transgender. Barnes said on Monday night that authorities “don’t know” whether the shooter “was transgender or not.” “And quite frankly, I don’t think that’s even important,” he said. “I don’t think that’s important at all. I don’t think that whatever happened today has anything to do with how she or he or they may have wanted to identify and I wish people would kind of leave their own personal biases out of this.” “So whether or not she was, he was, they were transgender — it’s something that may come out later, but for what we’re doing right now today, literally eight hours after a mass shooting in a school in Madison, it is of no consequence at this time,” the chief added. “And so I would encourage people to be responsible with your social media.” ALCS was beginning its last week before Christmas break. The school offers education for students from kindergarten through 12th grade. Police searched the home of the shooter’s parents with their consent on Monday evening, FOX’s Madison affiliate WMSN reported. “We’ll also be looking through her effects – if she had a computer or cell phone – to see if there are any transmissions between her and someone else,” Barnes added. CHECK OUT THE DAILY WIRE HOLIDAY GIFT GUIDE The chief said the parents “are fully cooperating,” and there is “no reason to believe that they have committed a crime at this time.” The first 911 call was made by a second-grader at the school around 10:57 a.m. after the shooter opened fire in a classroom during study hall, and police responded within minutes. Upon entering the school, officers found that the shooter was already dead and immediately began life-saving efforts on the wounded. Six people, including a teacher, were transported to area hospitals with injuries ranging from minor to life-threatening. Two of the victims have been released from the hospital. A teacher and a teenage student were pronounced dead at the scene of the shooting. Authorities have not revealed the identities of the victims as they wait for family members to be informed first. Pastor Chris Dolson, who spoke at a vigil on Monday night, said that one of the dead was a substitute teacher who came to work after another teacher called in sick, CBS News reported.