Another mall shooting: What can be done to increase security?

After a rash of mall shootings — including this weekend's Maryland mall shooting, last year's deadly siege of a mall in Nairobi, Kenya and the Garden State Plaza mall shooting in New Jersey that left one dead — retailers, mall operators and police have highlighted the dangers of malls as a target.

In the aftermath of Saturday's incident, which took the lives of two mall employees and the shooter himself, Homeland Security is calling for enhanced security at malls and more training sessions that educate employees and shoppers on what to do if a shooter is on the loose.

The two employees who were killed on Saturday both worked for Zumiez, an action sports clothing retailer. "We are deeply saddened by the violence that has occurred this morning within our store in Maryland at The Mall in Columbia. Our hearts go out to the victims and their families," the company wrote on its Facebook page. Story