A suicide bomber in Northern Afghanistan killed a district governor and two others on Thursday after walking into the administrator's office to hand over a letter, the police said.
Five people were also injured in the attack on Abdul Wahid Omerkhail, the governor of Chardara district in the Northeastern Kunduz province, a police commander said.
"The district governor and two of his companions have been killed. Five other people were injured," Abdul Rahman Aqtash, the deputy provincial police chief, said. He said the attack was carried out by a suicide bomber.
Aqtash said the attacker entered the district governor's office, presented a letter then detonated the bomb. The two others killed were identified as civilians, one of them a local community elder.
There was no claim of responsibility for the bombing but Taliban militants have in the past targeted government buildings and military bases, using suicide bombers to breach security guards.
There are around 140,000 US-led foreign troops in Afghanistan battling Taliban militants alongside Afghan forces, who are due to take responsibility for security in 2014.
Kunduz is the most troubled province in Northern Afghanistan, which has been increasingly affected by a conflict originally rooted in the South.
The Kunduz governor was killed last October in a major bomb attack on a mosque in the neighbouring province of Takhar.