No one immediately claimed responsibility for Wednesday's attack, but both Taliban and Islamic State group are active in eastern Afghanistan.
Trump had said the US was walking away from negotiations after nearly a year of grinding diplomatic efforts to strike a deal that could pave the way for an American withdrawal from Afghanistan.
Taliban spokesman Zabihullah Mujahid said the attack near Ghani's rally was deliberately aimed at disrupting the September 28 elections.
No one immediately claimed responsibility for the bombing, but the Taliban are active in the province and earlier this month launched an attempt to take the city of Farah.
Afghanistan rode on brilliant performances from Mohammad Nabi and Mujeeb Ur Rahman as they defeated Bangladesh by 25 runs in the third match of the ongoing tri-series.
The TAPI pipeline project seeks to build connectivity in the South and Central Asian regions through gas pipelines and will help ease energy shortages in South Asia.
A Taliban delegation held talks with Russian special envoy for Afghanistan, Zamir Kabulov, in Moscow to discuss the recent developments on the Afghan peace process.
President Donald Trump abruptly called off talks to end American's longest war last week.
Democratic presidential front-runner Joe Biden went on the offensive in the third Democratic debate of the 2020 White House race.
Ten candidates seeking the Democratic Party nomination to run against PresidentTrump in the election next year faced off in Houston in the third debate.
This comes following a spurt in the production of opium in Afghanistan in recent years
NIA is all set to approach the Afghan government seeking details of a Wayanad native who was held in Kabul and was deported for attempting to join the Islamic State (IS) in 2017.
The statement comes in the wake of Donald Trump pulling out of peace talks with the Taliban, after the extremist outfit claimed responsibility for a blast in Kabul which killed 12 people.
As fears of increased violence soared with presidential elections approaching later this month, Afghan troops and Taliban insurgents have been engaged in heavy exchanges across Afghanistan.
The Taliban have been holding talks with the U.S.for over a year in the Qatari capital, Doha, where the militant Islamic movement maintains a political office.