What are your library's policy and procedures?
Quiet of Herkimer library shattered by lockdown, gunshots. (Syracuse Post-Standard, 3/13/2013)
Tenants forced to evacuate their apartments went to the nearby public library for shelter. A few hours later, police told library staff to evacuate the library, or, as I actually translate it after reading the entire article, police allowed those who wished to leave the library to do so.
Next-to-last paragraph of article: After the library locked down, staff members and about a dozen patrons watched through the windows as the police gathered. Others followed reports of the action on the library computers.
If an active shooter was still in the area, I hope they were looking through the windows at a distance.
Active Shooter in the Library: How to Plan for, Prevent, and Survive the Worst. By Amy Kautzman. Library Leadership & Management.
What to do in an 'active shooter' situation. (2/19/2013)