Giffords's husband, Mark Kelly, was referring to a shooting in Ross Township, Pa., where three people were killed after a man opened fire Monday night. The man, Rockne Newell, was targeting people he felt were responsible for taking away his condemned house, according to Reuters.

One of the victims was a zoning official. The shooting happened at the monthly meeting of the Ross Township board of supervisors.

Kelly said he and Giffords were "saddened" by the news.

"The shooting bears a heartbreaking similarity to the Congress on Your Corner event in Tucson where a disturbed person fired dozens of rounds, wounding and killing Americans as they participated in one of the cornerstones of our democracy: a public meeting with elected officials," Kelly said.

Giffords was the target of a shooting rampage in 2011 when Jared Lee Loughner opened fire at a constituent event. Six were killed and 13 wounded in the shooting, including Giffords. Now Kelly and Giffords run Americans for Responsible Solutions, a group that advocates tighter gun laws.

In his statement Kelly also referenced other recent shooting massacres.

"These horrific shootings have become all too frequent, and we've learned that they don't discriminate," Kelly continued. "They can happen anytime, anywhere, from Tucson in the Southwest desert, to Aurora in the Rocky Mountains, to Oak Creek in suburban Wisconsin, now to Ross Township in rural Pennsylvania. We have to do more — all of us — to make sure future tragedies like last night's aren't visited upon other communities."