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The second and third blasts came after police, rescue team, people and reporters arrived at the site of the first explosion.
The unexpected move came two days after the Afghan government's own surprise announcement of a week-long halt to operations against the Taliban.
Three children were injured in the attack.
The six girls will now be able to participate next week against entrants from 157 countries.
A six-member team of Afghan schoolgirls has been finally granted US visas to participate in a global robotics competition.
Nine Islamic State militants were killed when the Afghan air force struck their hideout in Kunar province.
Mullah Bashir, the key Taliban commander in Wardak and who was also served as shadow district governor for Nurkh district was killed during the operation.
Most of the casualties in the explosion near the bank in the provincial capital of Lashkar Gah were civilians.
No group has claimed responsibility yet for the attack.
Ashraf Ghani inaugurated the air corridor during a ceremony at the Kabul International Airport — a direct route that bypasses Pakistan and is meant to improve commerce.
The deployment will be the largest of American manpower under Donald Trump's young presidency.
The Taliban and the Islamic State fighters have been trying to expand their influence in Darzab district and nearby areas.
The Tora Bora mountains hide a warren of caves in which al-Qaeda militants led by bin Laden hid from U.S. coalition forces in 2001, after the Taliban fled Kabul.
The warnings came as Trump was reportedly considering whether or not to send additional hundreds of US troops to Afghanistan.
Twelve militants were killed when government aircraft pounded Taliban hideouts in Afghanistan's Kunduz province on Tuesday, the army said.