Al Qaeda-linked Al Shabab claimed responsibility for the attack in capital Mogadishu, saying it killed six delegates and five police officers.
Following weeks of suspension, large crowds of Afghans have been thronging outside the passport office in a bid to get travel documents.
A Taliban spokesman confirmed the incident, saying a car bomb destined for the airport had been destroyed – and that a possible second strike had hit a nearby house.
Al Shabab attacker kills six police officers including commander of Waberi police district in capital Mogadishu, officials say.
Attacker blows himself up in an ice-cream parlour in capital Mogadishu, killing six people and wounding eight others, officials say.
Judge says two brothers "equally culpable for the deaths and injuries" at the sentencing of Hashem Abedi, the younger brother of suicide bomber Salman.
At least 70 people have been wounded in a suicide bombing and assault on Bagram Air Base north of capital Kabul.
"A suicide bomber wearing an explosive belt blew himself up close to stalls at the crowded Jamila market," said a senior police officer, who asked not to be named.
Police spokesman Basir Mujahid said the blast hit a vehicle carrying staff of Pul Charkhi prison.
The blasts came a day before the first anniversary of a truck bombing that left more than 500 dead in Mogadishu, the worst ever attack in Somalia which was blamed on militant group Al-Shabab.
A suicide attack claimed by the Taliban has killed three NATO Czech soldiers and wounded one US and two Afghan soldiers on a NATO foot patrol in eastern Afghanistan.
Daesh claimed responsibility for the attack, with provincial official Sohrab Qaderi saying, "most of the victims were children, who were working in a car wash close to the suicide bombing site."
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