At least 20 people have been killed in a suicide bombing in a crowded market in southern Afghanistan, police say.
Thirteen more were injured in the blast in Dihrawud in Uruzgan province.
The BBC reports this is worst such incident in Afghanistan in months and the dead were all civilians.
Police have launched an investigation, but say they believe that the blast was caused when a suicide bomber waiting to attack a military convoy accidentally set off his explosives.
The attack took place in the province of the Taliban's leader Mullah Omar.
On Wednesday, a UN report said the number of civilians killed in violence in 2009 was higher than in any year since the Taliban were ousted in 2001.
Civilian casualties rose by 14% in 2009 compared with 2008, the UN Mission in Afghanistan reported.