A bomb exploded alongside a NATO convoy in southeastern Afghanistan on Wednesday, inflicting an unknown number of casualties among troops, a senior police official said.
"At around 11:30 am (0700 GMT) this morning, an IED (improvised explosive device) exploded next to a foreign military convoy in the Rawza area of Ghazni city," said Ghazni province police chief Dilawar Zahid.
"There have been some casualties but we don't know the exact figure," he added, unable to say whether soldiers had been killed or wounded.
A spokesman for NATO's US-led International Security Assistance Force (ISAF) said only that he was "aware of an incident" in Ghazni.
"We are currently in the process of gathering facts and we can't provide any more details right now," he said.
A witness told AFP on condition of anonymity that an ISAF vehicle had been "totally destroyed" and saw helicopters evacuating casualties.
The Taliban claimed responsibility for the attack in a text message sent to AFP by spokesman Zabihullah Mujahid, claiming it was a Polish convoy and to have killed several NATO soldiers without providing any evidence.
Polish troops under ISAF are responsible for security in Ghazni. Poland has around 2,600 soldiers in Afghanistan.
