The Taliban claimed responsibility for the attack in the city of Kandahar, which provided a test for Afghan security forces as US and allied combat troops have handed over the lead in preparation for their withdrawal by the end of the year.
The three attackers - young men wielding hand grenades, automatic rifles and smaller weapons - entered Kandahar undetected in a white Corolla sedan, then got out and opened fire on guards deployed outside the former headquarters. The guards retreated inside while the insurgents took rooftop positions nearby, police said.
Commandos with the intelligence service, which had recently moved to a new building, moved in from a second direction, wearing body armor and helmets, their faces hidden behind scarves to protect their identities.
"They must not have known that the intelligence headquarters had relocated," deputy police chief Rehmatullah Atrafi told The Associated Press at the scene of the firefight.
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In a Pashtu language text message received by the AP, Taliban spokesman Qari Yusuf said their young fighters killed four intelligence commandos and five policemen. Their claims are often exaggerated.
Kandahar, the capital of the province with the same name, is the birthplace of the hard-line Islamic militant movement that held power in the country for five years until it was ousted in a 2001 US-led invasion following the September 11 terror attacks in the United States. It has been the site of some of the deadliest battles between insurgents and international troops, but Afghan forces have assumed responsibility for securing the area and only receive help from NATO forces when they request it.
"These young boys don't know any better. They can easily be manipulated into carrying out a suicide attack like this one," he said.