MARIETTA, Ga -- A sign of the times.

Nearly 1,000 people turned out for an Active Shooter Seminar conducted by the Marietta Police Department at Marietta High School Wednesday night.

Officers gave instructions on how to prepare, in advance, for an active shooter situation, and also offered tips on what to do when you're trapped inside the building during one.

Marietta Police held mini sessions for all city workers last week, but opened this one to the public.

Not only is interest in seminars like this on the rise, but demand for protect gear has soared.

Bullet Blocker, a company based in Massachusetts, said sales are up 70% since the Paris attacks.

That includes items for kids, such as bullet-proof backpacks.

"The weight is only 20 ounces more than a regular backpack, so that's like a bottle of water," said Joe Curran is President of Bullet Blocker, one of several companies selling protective gear online.

Bullet Blocker sells several items for kids, such as bulletproof coats, notebooks and tablet covers.

"When I was in school it was duck and cover and fire drills, but nowadays its lockdown drills, so the schools are already telling our kids that there's a potential that there's going to be an armed intruder in our schools," said Curran.