(CNN) -- Two civilian contractors killed in a suicide bombing in eastern Afghanistan earlier this week were Americans, the U.S. Embassy in Kabul said Tuesday.
The contractors were working with the NATO-led International Security Assistance Force when they died Monday.
The attack was a suicide car bombing targeting an ISAF military convoy in eastern Kabul, near the country's largest detention center, according to one of the city's district police chiefs, Akbar Ali.
Six other people were injured in the attack, Ali said.
The insurgent group Hezb-e-Islami Gulbuddin claimed responsibility for the attack, according to group spokesman Eng Haroon Zarghob.
Journalist Qadir Sediqi contributed to this report.