By Cheryll Simpson, NBC News in Kabul
KHOST, Afghanistan -- Three U.S. service members, their Afghan interpreter and 17 Afghan civilians were killed by an apparent suicide bomber on a motorbike in the?eastern Afghan city of Khost Wednesday, officials said.
The United States Embassy in Afghanistan issued a statement saying it "strongly condemns this cowardly attack," which is the?second on foreign forces in the troubled province this month.?
A U.S. official, speaking anonymously to The Associated Press, said the foreign troops killed were Americans.
However, a?spokesman for the NATO-led International Security Assistance Force (ISAF), said the nationality of the troops would not immediately be confirmed.
A local official told NBC News that women and children were among the civilian casualties in the attack, aimed at an American-Afghan military convoy passing through the town.
The official said the death toll was likely to rise, and that?32 Afghans suffered injuries.
Msnbc.com staff contributed to this report.
More world news from msnbc.com and NBC News:
Follow us on Twitter: @msnbc_world