KANDAHAR, Afghanistan — A Taliban suicide bomber rammed his vehicle into a NATO convoy in the southern Afghan city of Kandahar on Wednesday, killing two American soldiers, the Pentagon said.

Zia Durani, a spokesman for the governor of Kandahar, said the convoy had come under attack while traveling in the area of Shorandam, which lies on the main road from Kandahar Airfield, one of the largest American bases in the country.

“The area is cordoned off by the coalition forces,” he said. “We are not aware of their casualties.”

An initial American statement said there had been casualties among the convoy. Later, a Pentagon spokesman, Capt. Jeff Davis, confirmed that two Americans had been killed.