Militants have attacked a compound in Kabul that is used by foreign firms supplying equipment to NATO.
Police said militants opened fire on guards at the compound after a suicide car bomb blew up at the building's entrance gate on July 2.
Kabul provincial police chief Mohammad Ayuob Salangi said four guards and two civilians had been killed, along with all four attackers.
The two civilians were drivers of trucks waiting at the compound gate at the time of the explosion.
The guards were Nepalese contractors.
The Taliban later claimed it carried out the attack.
It comes a day after the Afghan Interior Ministry announced that insurgents had killed nearly 300 Afghan local and national police last month.
Interior Ministry spokesman Sediq Sediqqi also told reporters that 753 militants were killed in joint operations with the military and others, and more than 300 were arrested. Also, 180 civilians were killed.
Based on reporting by AFP, AP and RFE/RL's Radio Free Afghanistan