Richard Holbrooke, the US special envoy for Afghanistan and Pakistan, remained in critical condition Sunday following surgery to repair a torn aorta, the State Department said.

"Today, Ambassador Holbrooke underwent an additional procedure to improve circulation following yesterday's surgery," the State Department said.

Holbrooke, 69, took ill on Friday while working at the State Department on the building's seventh floor, where US Secretary of State Hillary Clinton has her office, and was hospitalized at George Washington University Hospital.

He underwent surgery to repair a torn aorta on Saturday.

He "remains in critical condition at George Washington University Hospital, where he is surrounded by his family, friends, colleagues and staff," the statement said.

His wife, Kati Marton, received calls from Presidents Hamid Karzai of Afghanistan and Asif Ali Zardari of Pakistan, it said.

"His family is grateful for the outpouring of support and prayers coming in from his many friends, colleagues and leaders around the world," it said.

President Barack Obama spoke by telephone with Holbrooke's wife on Saturday and said he and First Lady Michelle Obama "are praying for Richard."

THE NEWS