Children killed in Afghan blast
Schoolchildren were caught in the blast as they left classes
Another 30 people were injured, some seriously, in the attack on a market place in Dehrawood in Uruzgan province, where Taleban militants are active.
The bomber blew himself up near a Nato-led convoy, police said.
The Nato-led international force (Isaf) said seven of its soldiers were among the injured.
If the death toll is confirmed, this would be the third deadliest bomb attack in Afghanistan this year, says the BBC's Charles Haviland in Kabul.
Many children were caught in the explosion as they were leaving classes near a crowded bazaar in Dehrawood.
A Nato spokesman told the BBC he believed more than a dozen people had been killed and that Isaf troops were among the wounded.
The wounded were all being treated at an Isaf medical centre. Some of them were said to be in a serious condition.
Isaf had earlier said that at least six people had been killed in the attack.
The Nato spokesman said the attack showed a "wanton disregard" for the safety of civilians. The bombing contradicted recent public calls by insurgents that civilian casualties should be avoided, he said.
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