Tariq Arian, spokesman for the interior minister, said a spokesman for the ministry's public protection forces, a security force, was one of the three killed in the attack.
The officers died and a civilian was hurt when a magnetic bomb attached to a police vehicle detonated in western Kabul, said police spokesman Ferdaws Faramarz.
Unknown gunmen shot and killed Mohammad Yousuf Rasheed, executive director of the non-governmental Free and Fair Election Forum of Afghanistan, said Ferdaws Faramar.
The doctors worked at the Puli Charkhi prison, Kabul's main penitentiary, and were killed as they were on the way to their office in the city's Doghabad neighbourhood.
The dead and wounded included children, women and elders, said Tariq Arian, spokesman for the Interior Ministry. He added this was only the initial report of casualties, and that the toll could rise.
Accordng to an official, a sticky bomb attached to an armored vehicle belonging to Kabul's deputy provincial governor killed two people, and wounded two others.
According to the press release, the army repelled Taliban attacks in the Panjwai, Zhari, Arghandab and Maiwand districts of Kandahar.
The rockets were fired near the Hamid Karzai International Airport and the Khwaja Rawash area in Kabul.
The first blast occurred at around 7.10 a.m. in the Khair Khana area in PD11 from a magnetic IED placed on a Land Cruiser
The attack came hours before US Secretary of State Mike Pompeo was to meet with negotiators from the Afghan government and the Taliban in the Qatari capital Doha.
The salvo slammed into various parts of central and north Kabul -- including near the heavily fortified Green Zone that houses embassies and international companies.
The vaccine has been developed with breathtaking speed -- just 10 months after the genetic code of the novel coronavirus was first sequenced.
Afghanistan's First VP Saleh said the suspect has confessed that he was assigned to carry out the activities that could pressure the Afghan government.
No group or individual has claimed responsibility for the attack so far.
Violence and chaos have increased in Afghanistan in recent months with an attack last week on Kabul University that killed 22 people, many of them students.