OMAHA, Neb. (AP) — An estimated 300 people gathered for an “Officer, I Have Your Back Rally” at the Omaha Police Department on Monday.

They stood shoulder to shoulder along a plaza wall many holding signs and others wearing blue shirts with a “support blue” design.

Local organizers held the Labor Day rally to give people a place to show their support of police after four fatal shootings of law enforcement officers in the U.S. in recent weeks.

Melissa Nguyen, president of the Strength Behind the Badge organization, says she’s been married to a police officer nine years and never has she worried as she does now, especially when he’s in public in uniform, whether it’s pumping gas or at a restaurant.