From President Obama:

This morning, in an unspeakable tragedy, a number of Americans were shot in Tuscon, Arizona, at a constituent meeting with Congresswoman Gabrielle Giffords.  And while we are continuing to receive information, we know that some have passed away, and that Representative Giffords is gravely wounded.  We do not yet have all the answers.  What we do know is that such a senseless and terrible act of violence has no place in a free society.  I ask all Americans to join me and Michelle in keeping Representative Giffords, the victims of this tragedy, and their families in our prayers.

From the House Majority Leader:

“I was deeply horrified to learn today of the shooting of Representative Gabrielle Giffords and others in Tucson.  Our thoughts and prayers are with Congresswoman Giffords and her family, her staff, and the residents of Tucson on this sad day.   As this serious situation continues to develop, I remain in close communication with leaders of both parties, the Speaker’s office and the Sergeant at Arms.  We will remain in constant communication regarding any schedule changes.”