At least seven people have been killed and many others injured when a suicide bomber detonated a car filled with explosives outside a US base in eastern Afghanistan, the US military said.
A Taliban spokesman told Al Jazeera on Wednesday that the group had attacked Camp Salerno, 4km outside Khost.
"Twenty-one local nationals were wounded and seven were killed," April Campbell, a US military official, said.
Al Jazeera's Zeina Khodr, reporting from the Afghan capital, Kabul, said: "The Taliban have claimed responsibility and, according to the Taliban, they killed a large number of foreign and Afghan forces.
"This is the third time there has been an attack outside Camp Salerno with the US spokesman telling us the Taliban 'dreams of entering the base but all they're doing is killing Afghans'."
The blast on Wednesday occurred at an entrance where Afghan workers queue to enter the base.
"Yesterday, in a nearby mosque, the Taliban distributed leaflets, warning Afghans not to work for the US company KBR, a construction firm that works inside Salerno, warning them that if they continue working with them, they will be punished," Khodr reported.
Salerno is the third-largest US base in Afghanistan.
On Tuesday, Taliban fighters took control of government buildings in Khost, barricading themselves inside and taking a number of people hostage.
The government buildings were later retaken by Afghan and US forces.
PHOTO CAPTION
Afghan policemen move towards government buildings after attacks in Khost province May 12, 2009.
Al-Jazeera