A.L.I.C.E. stands for Alert, Lockdown, Inform, Counter and Evacuate.
During the drill, police will fire blanks to expose everyone to the sound of gunfire in the building. The blanks will not be fired at anyone.
"The faculty and staff have been apprised of the situation and over the next few days the students will be shown a PowerPoint in homeroom, providing them with the needed information," the letter to parents said.