The Department of Homeland Security (DHS) recommends that when an active shooter is nearby, the best course of action would be to RUN, HIDE or FIGHT.
WHAT TO SAY WHEN YOU CALL 911
Dial 911 as soon as you think it is safe. Remain calm and give the following information:
WHAT TO DO WHEN LAW ENFORCEMENT ARRIVES
Find this and additional safety information in the leaflet provided by Securitas Inc.