An Afghan official said a blast on a road near the main base for U.S.-led troops in Afghanistan has killed six civilian family members, including two children.

The Interior Ministry said it remains unclear whether Tuesday's explosion near the Bagram airfield, 60 kilometers outside Kabul, was caused by a roadside bomb or suicide attack.

The Peshawar-based Afghan Islamic Press said Tuesday that a Taliban spokesman claimed responsibility for a suicide attack at a foreign military base near Bagram.  It was not immediately clear if the claim referred to the same incident.

Separately Tuesday, the NATO-led force said insurgents killed a coalition soldier in eastern Afghanistan.  It did not immediately release the nationality of the soldier.

On Monday, Afghan officials and NATO spokesmen said a series of clashes across the country killed four American soldiers, four Afghan police officers and at least eight militants.

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