Others used the opportunity to plead for information about the shooting and to deplore such senseless violence.
For the men and women in big cities and small towns who fall victim to senseless violence each and every day.
WHITEHOUSE: President Obama Introduces a Plan to Reduce Gun Violence
The Defense chief says it's senseless violence, effective only in fueling chaos.
"We are shocked and dismayed at this senseless violence, " he said in a statement, calling on the labor movement and company to work with the government to stabilize the situation.
While the United States rejects efforts to denigrate the religious beliefs of others, we must all unequivocally oppose the kind of senseless violence that took the lives of these public servants.
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We have to help work with the overwhelming majority of Muslims who reject senseless violence of this sort, and to work to provide different pathways and different alternatives for people expressing whatever policy differences that they may have.
And I hope that over the next several days, next several weeks, and next several months, we all reflect on how we can do something about some of the senseless violence that ends up marring this country, but also reflect on all the wonderful people who make this the greatest country on Earth.
But I think there's New Orleans fatigue, not - and it's become old news and I think that's sad and I think maybe we need to bring some of the issues about the rebuilding of New Orleans back into the news, and I think violence - senseless violence like this has become part and parcel of how it goes down in New Orleans, sadly.
"It's now time for mourning those who we lost in this senseless act of violence, " he said.
Our actions will not prevent every senseless act of violence in this country.
"That this senseless act of violence should be targeted at a place of religious worship is particularly painful, " Singh, himself a Sikh, said.
No single law -- no set of laws can eliminate evil from the world, or prevent every senseless act of violence in our society.
And as I said on Sunday night, there's no law or set of laws that can prevent every senseless act of violence in our society.
The National Association of School Psychologists, which has 22, 000 members, has provided information about ways to help children begin recovering from "this senseless act of violence".
Because while there is no law or set of laws that can prevent every senseless act of violence completely, no piece of legislation that will prevent every tragedy, every act of evil, if there is even one thing we can do to reduce this violence, if there is even one life that can be saved, then we've got an obligation to try.
WHITEHOUSE: President Obama Introduces a Plan to Reduce Gun Violence
Colombia's current troubles have their roots in what is called The Violence, a senseless, murderous civil conflict that raged from 1948 to 1958, killing more than 200, 000 people.
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