Obama, others condemn Kansas abortion doctor's killing

(CNN) - A roundup of reaction to Sunday's killing of Dr. George Tiller, one of the few U.S. physicians to perform late-term abortions, as compiled by The CNN Wire:

President Barack Obama:
"I am shocked and outraged by the murder of Dr. George Tiller as he attended church services this morning. However profound our differences as Americans over difficult issues such as abortion, they cannot be resolved by heinous acts of violence."

U.S. Attorney General Eric Holder:
"The murder of Dr. George Tiller is an abhorrent act of violence, and his family is in our thoughts and prayers at this tragic moment. Federal law enforcement is coordinating with local law enforcement officials in Kansas on the investigation of this crime, and I have directed the United States Marshals Service to offer protection to other appropriate people and facilities around the nation. ... As a precautionary measure, we will also take appropriate steps to help prevent any related acts of violence from occurring."

Nancy Keenan, president, NARAL Pro-Choice America:
"Dr. Tiller's murder will send a chill down the spines of the brave and courageous providers and other professionals who are part of reproductive-health centers that serve women across this country. We want them to know that they have our support as they move forward in providing these essential services in the aftermath of the shocking news from Wichita."

David O'Steen, executive director, National Right to Life Committee:
"The National Right to Life Committee unequivocally condemns any such acts of violence regardless of motivation. The pro-life movement works to protect the right to life and increase respect for human life. The unlawful use of violence is directly contrary to that goal."

Kim Gandy, president, National Organization for Women:
"This kind man and skilled doctor braved blockades, harassment, assault, and countless threats, including an attempted murder in 1993 when he was shot in both arms. He knew his life was in constant jeopardy, and that he would likely die at the hands of an anti-abortion terrorist - yet he continued to protect his patients and provide safe and legal abortions to women in often-desperate circumstances."

Troy Newman, president, Operation Rescue:
"Operation Rescue has worked for years through peaceful, legal means, and through the proper channels to see him brought to justice. We denounce vigilantism and the cowardly act that took place this morning. We pray for Mr. Tiller's family that they will find comfort and healing that can only be found in Jesus Christ."

Randall Terry, founder and former president, Operation Rescue:
"George Tiller was a mass murderer. We grieve for him that he did not have time to properly prepare his soul to face God. I am more concerned that the Obama administration will use Tiller's killing to intimidate pro-lifers into surrendering our most effective rhetoric and actions."

Cecile Richards, president, Planned Parenthood Federation of America:
"The entire Planned Parenthood family is deeply saddened by the murder of Dr. George Tiller. While he was not a Planned Parenthood provider, he was an integral part of our community and his loss is felt by all of us. Our thoughts and prayers go out to his family and those close to him who are suffering a personal tragedy."

Charmaine Yoest, president, Americans United for Life:
"We condemn this lawless act of violence. The foundational right to life that our work is dedicated to extends to everyone. Whoever is responsible for this reprehensible violence must be brought to justice under the law."