Dr. Dilip Joseph and two other staff members for the international aid group Morning Star Development were kidnapped by armed men on December 5 as they returned from a rural medical clinic in eastern Kabul province.
Three U.S.-led troops southwest of Kabul in Wardak province were also killed Thursday.
The bomber targeted 18 lawmakers who had gone to Baghlan province north of Kabul.
Thirty-seven-year-old Zakira Zaki(ph) is a parliamentary candidate from Parwan province northwest of Kabul.
Afghan officials said on Monday that a chartered helicopter had been forced down by bad weather in the Mangal valley, an isolated area of Logar province south of Kabul.
In one recent debacle in Laghman, a province east of Kabul, 300 Afghan soldiers, acting independently of NATO, were ambushed by the Taliban and many were killed or captured.
Over the past week, Taliban bombing attacks in Kandahar, Ghazni, Baghlan and other provinces killed dozens of people, including the head of the provincial council of Baghlan, a strategic province north of Kabul.
It followed the U.S.'s abrupt cancellation of its planned handover of the main U.S. detention facility at Bagram Air Field, and Mr. Karzai's demand that U.S. Special Operations forces leave the strategic province of Wardak near Kabul.
The aircraft landed in strong winds and heavy rain on Sunday in a village in the Azra district of Logar province, southeast of Kabul and about 30 kilometers, or 20 miles, from the Pakistan border, said district governor Hamidullah Hamid.
In another flash point in relations, Mr. Karzai last month ordered U.S. Special Operations forces to leave the province of Wardak near Kabul, following allegations that the Americans or their Afghan allies have killed local civilians, including a local student allegedly found with his throat slit after his detention.
According to an article published in November 2002 in the British The Guardian newspaper, authorities there have been investigating a series of attacks by suspected Taleban sympathisers against girls' schools in the province of Wardak, near Kabul.
Survivors of the Afghan victims, meanwhile, met late last week with Afghan leaders in Kabul, and were flown back to Kandahar province.
Mr. Karzai who was first installed by the U.S. after the Taliban was ousted in late 2001 has also wrested new concessions from the U.S., most recently winning an agreement for the withdrawal of coalition special-operations troops from Wardak province, an area west of Kabul that has been a staging ground for insurgent attacks.
Mr. Zarghun said the bomber was an Afghan man from the province of Logar, just south of Kabul.
They have reasserted control in isolated areas of Afghanistan such as Nuristan Province, a mountainous region north of Kabul and adjacent to Pakistan.
The base has been described as "not regular" - a phrase that implies it was a centre of CIA operations in Khost province, the BBC's Peter Greste in Kabul says.
BBC: CIA chief confirms seven officers killed by Afghan bomb
On August 17th, several hundred neo-Taliban swept across a porous border from Pakistan into Paktika province, storming a police station and gunning down eight Kabul loyalists, including the local police chief and his son.
For many, the recent attack by 100 Taliban fighters in the province of Kapisa, a largely Tajik enclave 60 miles from Kabul, illustrates the strengthening hold of the group across Afghanistan.
The opposition forces further claim to have seized the strategic town of Pul-e-Khumri, north of Kabul, and the town of Qala-e-Nau in the western province of Badghis.
The bus began its journey in the capital of Helmand province and was scheduled to stop in Kandahar city, then travel north to Kabul, the Afghan capital, Razaq said.
After a U.S. airstrike in August that killed dozens of civilians in the western province of Herat, U.S. Defense Secretary Robert Gates traveled to Kabul to apologize to Karzai.
CNN: U.S. vows to 'back off' if fighters use Afghan civilians as cover
The new plan includes six of the country's 34 provinces, including Kabul, seven major cities, including Jalalabad, and dozens of districts, including Helmand province's Marjah, which was the first target last year of U.S. Marines at the forefront of the American military surge meant to cripple the Taliban-led insurgency.
Warlords such as Ismail Khan, operating out of the western province of Herat, siphon off customs revenue at source, sending only a fraction of the receipts to Kabul.
ECONOMIST: Now the country's fragile peace must be made to stick
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