Fairfax Campus

An alert buzzed on cellphones and computers Tuesday morning, warning of an active threat to George Mason University: "Mason Alert: A person with a weapon is on the Fairfax Campus. RUN, HIDE, or FIGHT," the email began.

An alert buzzed on cellphones and computers Tuesday morning, warning of an active threat to George Mason University: "Mason Alert: A person with a weapon is on the Fairfax Campus. RUN, HIDE, or FIGHT," the email began.