At least seven people were killed and 21 wounded by three blasts that rocked the Afghan capital Thursday ahead of the election season.
The bombings came amid a wider surge in violence in Kabul and around Afghanistan, where the war is taking a brutal toll even amid a US-led push for a peace deal with the Taliban.
No group immediately claimed responsibility for the attacks, which came just three days before the official campaign season for the September 28 presidential election gets underway.
Previous polls have been marred by violence and bloodshed from the Taliban and other insurgent groups who refuse to recognise Afghanistan s fragile democracy.
According to interior ministry spokesman Nasrat Rahimi, the first blast came around 8:10 am (0340 GMT) when a suicide bomber riding a motorcycle hit a bus in eastern Kabul. He said the bus belonged to the ministry of mines and petroleum.
Rahimi said two other blasts had occurred, including a car bomb, also in eastern Kabul.
Rahimi put the death toll at seven with another 21 wounded. It was not immediately clear if this was from all the blasts or just the first.
