KABUL — Seven NATO soldiers were killed in separate attacks Sunday, including six Americans in a single bombing, military officials said.

The six U.S. servicemembers were killed by a roadside bomb in eastern Afghanistan and the seventh was killed in an “insurgent attack” in Southern Afghanistan, though officials have not released further details.

Taliban spokesman Zabiullah Mujahid claimed responsibility for the attack in Wardak province, just south of Kabul, in a statement. They were the latest American casualties from bombs planted by insurgents along roads, paths or mountain tracks.

A local government official said the bombing damaged a military vehicle in the village of Mala Khail in Maidan Shahr district, though other media outlets are reporting that the bombing took place in neighboring Jalrez district.

The official said an airstrike following the bombing killed a local Taliban commander and injured three other insurgents, adding that there were no reports of civilian casualties.

The killings follow the June 27 roadside bomb attack that killed two U.S. soldiers in Maidan Shahr, 1st Lt. Stephen C. Prasnicki, 24, assigned to the 173rd Airborne Brigade Combat Team in Bamberg, Germany, and Sgt. James L. Skalberg Jr., 25, assigned to the 3rd Brigade Combat Team, 1st Armored Division out of Fort Bliss, Texas.

Sunday was one of the most violent days in the country for months.

Some 35 people are said to have been killed in insurgent attacks, including the seven servicemembers. Twenty-eight Afghan civilians and police were killed in Kandahar and Helmand provinces in the south.

“Yesterday was a tough day for Afghan civilians, coalition [forces] and Afghan forces,” said the new ISAF spokesman, German Brig. Gen. Günter Katz. “A number of people were killed due to a number of roadside bombs and conflicts.”

The violence came on the same day that some 70 nations pledged $16 billion for the continued development of war-torn Afghanistan.

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