At least one witness reported seeing three bodies pulled from one of vehicles.
A Taliban suicide bomber attacked a NATO military convoy as it was traveling in Kandahar City in southern Afghanistan. Currently, about 8,400 American troops are in Afghanistan, alongside about 5,100 NATO personnel.
The deaths were the second and third fatalities announced by the Department of Defense on August 2. The Taliban have been known to exaggerate claims.
"US Forces Afghanistan will provide additional information as it becomes available", he added. "The attack did cause casualties".
Eyewitness said the blast was so powerful that it jerked the entire area. The insurgents' spokesman for southern Afghanistan, Qari Yusuf Ahmadi, said fighter Asadullah Kandahari carried out the attack with a small pickup truck packed with explosives.
Kandahar, once the seat of Taliban power, had remained relatively quiet in recent years even as Taliban made inroads in surrounding provinces.
The kiwi took a tumble after Statistics New Zealand released figures showing employment shrank 0.2 percent in the three months ended June 30. Two of them have been claimed by the Islamic State's regional branch.
An initial statement said there had been casualties among the convoy.
US President Donald Trump has yet to announce his Afghanistan policy.
But the Taliban have shown no interest in peace talks. The Sunni militant group considers Shiite Muslims as apostates. The Islamists now control more Afghan districts than at any other time since 2001.
An inconsistent U.S. policy may create a space for Pakistan officials to use all the above options, some analysts say. The amendment was moved by Senator John McCain, the head of Senate's Arms Services Committee, whose such initiatives often get approval of Congress. China employs the development card to unseat the U.S. from Afghanistan. For Russia the memories are still fresh how the United States unleashed "jihad" against the Soviet forces that occupied Afghanistan in 1979.