KABUL, Afghanistan  A British photographer on a foot patrol with Afghan and American soldiers in southern Afghanistan was gravely wounded this week when he stepped on a makeshift bomb, military officials and his family said.

The photographer, Giles Duley, was working on Monday beside soldiers from the First Squadron, 75th Cavalry Regiment, near the village of Sangsar in rural Kandahar Province when he stepped on a pressure plate that detonated a hidden explosive charge, according to the United States military.

Mr. Duley, 39, lost one leg below the knee, the other leg above the knee and his left arm was severed above the elbow, according to his brother, David Duley. A finger on his right hand was fractured, and he had other superficial wounds. He was the second photographer to suffer multiple amputations while covering the military campaign in Kandahar since last fall.

But he did not suffer internal injuries or a head wound, his brother said by telephone, and he has been conscious and lucid while undergoing treatment in the Queen Elizabeth Hospital in Birmingham, England. No one else was wounded in the blast.