At 11:22 a.m., a custodian called Deputy Neil Gardner, the assigned resource officer to Columbine, on the school radio, requesting assistance in the senior parking lot. The only paved route took him around the school to the east and south on Pierce Street, where at 11:23 a.m., he heard on his police radio that a female was down, and assumed she had been struck by a car. While exiting his patrol car in the senior lot at 11:24, he heard another call on the school radio, "Neil, there's a shooter in the school."