US President Barack Obama is scheduled to attend a memorial service Wednesday for the victims of the deadly shooting incident in Arizona that killed six people and injured several others, including Congresswoman Gabrielle Giffords, who is now battling for life in hospital.
Obama, in his speech, is likely to focus on the victims of the attack and on the idea of service to the country.
"In Tucson, the President and the First Lady will attend the memorial event 'Together We Thrive: Tucson and America' at the University of Arizona to support and remember victims of the mass shooting in Tucson," the White House said.
Attorney General Eric Holder, Secretary of Homeland Security Janet Napolitano and Justice Anthony Kennedy, Circuit Justice for the United States Court of Appeals for the Ninth Circuit, will also attend the memorial event, it said.
"The president thought it was important to visit the Tucson community since this tragedy touched everyone there as well as the entire country in some way," White House spokesman Nick Shapiro said.
This would be the third time that Obama will lead the US in mourning after a national tragedy, since taking office.
He had done the same after the killing of 13 soldiers in November 2009 and the death of 29 men in the country's worst coal mining disaster in four decades.
Meanwhile, doctors attending on Congresswoman Giffords said she remained in critical condition, even though there was no further deterioration in her situation.
"I'm happy to say that she's holding her own. Her status is the same as it was yesterday. She's still following those simple commands. We've been able to back off on some of that sedation.
"In fact, she's able to generate her own breaths; she's breathing on her own. The only reason we keep that breathing tube in is to protect her airway so that she doesn't have complications like pneumonia," said Dr Michaele Lemole, section chief, Neurosurgery, at Tucson's University Medical Center.
Two others injured in the shooting incident, continued to remain critical, he told reporters.
"Giffords's going to take her recovery at her own pace. And I'm very encouraged by the fact that she has done so well. But I do want to underscore the seriousness of this -- of this injury and the fact that we all have to be extremely patient," Lemole said.
The Congresswoman was shot in the back of her head on Saturday at a public function held at a grocery store in Tucson, Arizona. 18 others were also injured in the incident.
The alleged shooter, Jared Lee Loughner, 22, appeared in a Phoenix courtroom on Monday afternoon amidst tight security.