The capital has been relatively quiet in recent months following a spate of bombings, many claimed by the local Islamic State affiliate. The Taliban, who have also carried out attacks in Kabul, said they had no claim of responsibility for Monday's blast. In recent months most Taliban attacks have targeted Afghan and US. military installations or convoys.
The explosion came as the latest round of talks between the United States and the Taliban moves into a third day in the Middle Eastern state of Qatar, where the militant group maintains a political office.
The Taliban said their focus during the talks is on getting an announcement of a timetable for the withdrawal of US and NATO troops from Afghanistan. The announcement is likely to be accompanied by a Taliban promise to hold intra-Afghan talks and agree to an eventual ceasefire.
Suhail Shaheen, spokesman for the Taliban's political office in Doha, told The Associated Press on Monday that "our main concern is to make sure a timeline for troop pullout is announced".
Taliban officials have previously told the AP they want all foreign troops withdrawn within six months, while Washington has pushed for a longer timeline of a year to 18 months.
The Taliban have refused to hold talks with the Afghan government, calling it a US puppet. They say Washington is the final arbiter on the troop withdrawal, which the insurgents see as the central issue.
Washington accelerated attempts to find a negotiated end to America's longest war with the appointment last September of Afghan-born American Zalmay Khalilzad, who was a special presidential representative to Afghanistan and later US ambassador in Kabul in the years immediately following the ouster of the Taliban.
During a visit last week to the Afghan capital, US Secretary of State Mike Pompeo said Washington would like to see an agreement before September 1, considered an ambitious deadline by analysts but likely linked to Afghan presidential polls scheduled for later that month. Washington has expressed concern the elections could hamper a peace deal and has quietly advocated for an interim administration for up to two years following an agreement.
- AP