http://www.guardian.co.uk/world/2009/aug/06/af ghanistan-bomb-tractor-wedding-taliban I think we can safely say that this tragic event and the separate killing of 5 Afghan policemen (also by a road side bomb), was the work of the Taliban.
But having said that, local police said an air strike killed five farmers loading cucumbers late at night, into a taxi in southern Afghanistan, but a US spokeswoman said the five were militants placing explosives in a van.
The US last month imposed rules attempting to limit civilian casualties in response to growing resentment at the deaths of ordinary Afghans.
The question must be asked, how do they limit civilian casualties when the civilians do not look any different to the Taliban?