Atleast 4 dead in blast at district headquarters in Somali
Capt Mohamed Hussein said the large blast badly damaged the compound of the Hodan district's headquarters.
An Associated Press journalist saw at least seven bodies at the scene.
This is the second such attack on a district headquarters in the capital this month. The Howlwadag district headquarters was targeted on September 2 and at least six people were killed, including two children.
The al Qaida-linked al-Shabab extremist group often claims responsibility. The Somalia-based group often targets the capital with bombings, including a truck bombing in October that left at least 512 people dead.
Somali troops are meant to take over the Horn of Africa nation's security in the coming years from an African Union force but concerns about their readiness remain high.
The UN Security Council recently voted to delay the reduction of troops in the AU force from October to February and the target date to hand over security to Somali forces to December 2021.