At least four people have been killed in an attack on a foreign military base in western Afghanistan, officials say.
Al Jazeera's Qais Azimy, reporting from Kabul, said "four men attacked the provincial reconstruction team of the ISAF building" in Herat on Monday.
He said hospital sources confirmed that at least four were killed and 33 others wounded in the ongoing attack.
Taliban claimed responsibility for the attack, with its spokesman, Qari Yousuf Ahmadi, telling AFP:"Our mujahideen are working on the operation in Herat".
Reuters news agency quoted a witness as saying that he saw the bodies of several troops wearing foreign uniforms and saw smoke rising near the Italian-run joint civilian and military provincial reconstruction team (PRT) base.
A second Reuters witness said it appeared an unknown number of fighters had entered a seven-storey building near the PRT and began opening fire on the base from there.
Majority Italians
Italian troops form the bulk of the NATO-led International Security Assistance Force (ISAF) in the area but there was no immediate confirmation of casualties from ISAF.
Italy has about 3,880 troops in Afghanistan, the majority of them in the west.
A spokesman for ISAF in Kabul said the force was aware of reports of the attack and was looking into them.
Television pictures from Herat showed at least two vehicles destroyed by explosions and troops scurrying for cover.
Violence has spiked across Afghanistan since the Taliban announced at the beginning of May the start of a spring offensive.
Attacks have taken place in cities across Afghanistan in recent weeks, with the Afghan government and security forces and foreign military targets singled out in increasingly bold assaults.
PHOTO CAPTION
NATO Soldiers run to rescue a colleague stuck under debris after an attack in Herat, west of Kabul, Afghanistan, Monday, May 30, 2011.
Al-Jazeera