British Prime Minister David Cameron apologized after a British judge issued a scathing report criticizing troops for killing 14 unarmed civilians in a 1972 clash in Londonderry, Northern Ireland.

"What happened should never ever have happened,” the Telegraph of London quoted Cameron as saying. "I am deeply, deeply sorry."

He was reacting to the Bloody Sunday Inquiry report, issued Tuesday, which said paratroopers had lost control and opened fire without warning on unarmed civilians. Some were trying to flee, and soldiers lied to cover up their actions, the report found.

A total of 13 unarmed civilians, including seven teenagers died in Londonderry when soldiers opened fire during clashes after the banned march was stopped from entering the city center on Jan. 30, 1972. A 14th man died later.

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