The 203rd Thunder Corps of the Afghan Military in the Southeast said the incident has taken place in the vicinity of Charkh district.
A statement by the Thunder Corps stated that a number of youths had gathered in Ismail Khel village in support of peace process when an explosion took place among them.
The statement further added that the blast has left at least eight people dead while at least four others were wounded.
A woman and child were among those killed, the Thunder Corps said, adding that the Afghan armed forces strongly condemn the attack on ordinary and innocent civilians, calling it a move against the humanity and Islamic values.
The anti-government armed militant groups including Taliban militants have not commented regarding the report so far.
Logar is among the relatively calm provinces in Central parts of Afghanistan where fewer security related incidents have taken place since the fall of the Taliban regime.
However, the anti-government armed militants have been attempting to expand their foothold and destabilize the province during the recent months and years.