Afghan officials say a suicide car bomb attack targeting a NATO-led convoy in western Herat province killed five civilians and wounded at least 19 others Monday.

Also Monday, the U.S. military said U.S.-led forces killed some 55 militants, including three Taliban leaders, during clashes in eastern Paktika province.

The military says fighting erupted Friday after Taliban militants ambushed coalition troops.  Twenty-five insurgents were wounded and three detained in the operation.

In eastern Nangarhar province, NATO forces prevented four militants from planting a roadside bomb, killing one insurgent, but denied reports that two civilians also died in the incident.

However, hundreds of people blocked a road in the Kogyani district to protest the alleged killing of a father and son in the clash.

Afghan officials say the victims died in their home when it was hit by a projectile fired by coalition forces.

A Taliban spokesman, describing fighting in the district, said Monday militants killed 10 foreign soldiers.  Coalition and Afghan officials have not commented on the report.

In another development, Britain's Foreign Office said Monday a British television journalist kidnapped on the Afghan-Pakistani border was released after spending three months in captivity.

British officials say Sean Langan, working on a documentary for Britain's Channel 4, was released late Saturday.

Some information for this report was provided by AFP, AP and Reuters.