
The accident happened in Yaqubi mosque while people were voting, Khost governor spokesman Salem Mangol said.
A woman was killed and a kid was injured in the deadly blast.
According to Khost Police spokesman Basir Bina, a bomb which has been laden in the mosque caused the explosion.
No group or individual has yet claimed the responsibility of the accident.
Khost is a city in eastern Afghanistan, and the largest city of Loya Paktia. To the east of Khost lie Waziristan and the Kurram Valley in Pakistan.
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