An explosion outside an apartment complex close to diplomatic missions in Kabul injured a policeman on Friday.
"Explosives planted in a bicycle went off," Kabul's Deputy Police Chief Salem Almas said.
The bicycle bomb injured a police guard stationed outside the Macroyan apartment complex, where the country's Election Complaints Commission resides, Afghan Interior Ministry spokesman Sediq Sediqqi said. He added that it was unclear if the commissioner was the intended target.
Suicide bombings and other attacks by Taliban militants routinely target Afghan government figures and NATO allies, but Kabul had recently enjoyed several weeks of relative calm.
In February, the Taliban claimed responsibility for a suicide attack on a government compound in Afghanistan's eastern province of Kunar that killed 13 people and wounded 40 others.
Hours after the incident, a second suicide attack near the defence ministry by a Taliban militant left 15 people dead and 33 wounded in the Afghan capital.