Republican presidential hopeful Rick Santorum criticized President Barack Obama's apology for the burning of Qurans in Afghanistan, adding that Afghanistan should apologize to the U.S. for the deaths of four U.S. soldiers during six days of violence sparked by the incident.

"There was nothing deliberately done wrong here," Santorum said Sunday on ABC's "This Week". "This was something that happened as a mistake. Killing Americans in uniform is not a mistake. It was something that deliberate."

More than 30 people have been killed in clashes since it emerged Tuesday that copies of the Muslim holy book and other religious materials had been thrown into a fire pit used to burn garbage at Bagram Air Field, a large U.S. base north of Kabul. Protesters angry over Quran burnings by American troops lobbed grenades Sunday at a U.S. base in northern Afghanistan and clashed with police and troops in a day of violence that left seven international troops wounded and two Afghans dead.
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