According to police the explosion happened at around 08:00 in the morning in 4th Macroryan.
The magnetic IED had been placed on a Toyota vehicle before being detonated.
Yama Siawash, a journalist and former TV news anchor was among those killed, family members confirmed.
Siawash had taken time off work and spent the past year in India doing an MBA. According to his family he graduated with top marks.
Baktash Siawash, his elder brother, was an MP for Kabul province in the previous parliament.
President spokesman Sediq Sediqqi condemned attack on former journalist Yama Siawash, an employee of the Central Bank, who had just recently started working with govt.
So far no group including the Taliban claimed responsibility for the attack.