(Adds Afghan defence ministry comment, paragraphs 2)

KANDAHAR, Afghanistan, May 15 (Reuters) - Sixty Taliban fighters including three commanders were killed in overnight air strikes on two rebel bases in the southern Afghan province of Kandahar, a provincial police chief said on Tuesday.

A spokesman for the Afghan Defence Ministry gave a lower death toll. "I can confirm only 11 dead, including a Taliban commander," Zahir Azimi said.

The joint operation involving foreign and Afghan security forces took place in the Zharai district of Kandahar, police chief Esmatullah Alizai told Reuters. He said there were no casualties among the foreign or Afghan forces.

A U.S. military spokesman said he was aware of the reports and was checking them. NATO said it was not aware of any involvement in such an operation.

Violence has surged in Afghanistan in recent weeks after the traditional winter lull. Hundreds have been killed already this year after more than 4,000 people died last year.

In the latest attack, a roadside bomb killed seven Afghan soldiers in the eastern province of Nuristan on Monday, the defence ministry said. Four soldiers were missing after the blast.

The Taliban, who lost their top field commander in a clash at the weekend, could not be contacted immediately for comment about their reported losses in Kandahar.

Mullah Dadullah was killed in a battle with U.S.-led forces in what was seen as the most serious blow to the Taliban since the insurgency began.

Afghans have protested the deaths of civilians in air strikes by the U.S.-led coalition. (Additional reporting by Sayed Salahuddin in KABUL)

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