"At 07:45 a.m. [03:15 GMT], in the second police district [in Kabul], a bus with government employees was targeted by a bomb blast, as a result of which we have received two wounded people so far," Wahidullah Mayar tweeted.
READ MORE: Bomb Kills 3, Injures 20 During Prayers in Kabul Mosque —Ministry
A spokesman for the Public Health Ministry said that two people had been hospitalized after the attack.
No militant group has claimed responsibility for the attack so far.
The attack comes just a few days after at least two people, including an imam, were killed and 17 others were injured in a bomb blast at a mosque in Kabul during prayers.