A suicide bomber drove his car into the gate of an army base in southern Afghanistan and detonated his explosives, killing three civilians, a provincial official said.
The bombing Friday in Shajoy district of Zabul province also seriously wounded four Afghan army soldiers, Deputy Gov Gulab Shah Alikhail said.
The attacker died in the explosion, he added. Meanwhile, the death toll from a suicide bombing Thursday in eastern Khost province rose to at least eight. Officials originally reported only one death from the explosion outside a government office compound and said at least 13 others were wounded. Deputy police chief Yaqoob Khan said seven of the injured later died in a hospital, including three civilians.
The US military also reported that Afghan and coalition forces killed four militants in a clash north of Kabul on Thursday.
The fighting broke out when troops from the US-led coalition were searching a compound associated with Hizb-e-Islami, an Islamic faction led by warlord Gulbuddin Hekmatyar, US forces said in a statement.
People barricaded in the compound fired on the troops, it said. Coalition and Afghan forces returned fire, killing four people and capturing three others, the statement said.
The clash occurred in northern Kapisa province's Tagab district. Provincial police Chief Matyullah Safi confirmed the four deaths and that they were members of Hizb-e-Islami.
U.S. forces said they also detained five suspected militants in a separate strike in Khost province on Thursday.