Gun battle between the security forces and a group of at least four other militants broke out after the blast which continued sporadically until earlier this morning.
Sediq Sediq, spokesman for the Ministry of Interior (MoI), said Police Special Forces have been deployed in the area following the attack.
Deputy interior minister for security Gen. Ayub Salangi said the gun fighting finished after the remaining three suicide bombers were shot dead by the security forces.
Kabul Police Chief Abdul Rahman Rahimi said at least seven policemen were injured in the attack but did not say anything about the civilian casualties.
The target of the explosion was the house of the former provincial governor of southern Helmand province Naeem Balouch.