According to initial reports, several trucks have been engulfed in flames after a gas tanker exploded Saturday noon.
Afghan media cited Waheed Qatali, governor of the western province of Herat, as saying that Iranian authorities had been asked for urgent assistance to contain the blaze.
It was not immediately clear what caused the gas tanker to explode.
Unconfirmed reports suggest that around 300 trucks have been engulfed in the fire and the number of fatalities could rise to at least 50.
According to Afghan officials, the explosion has cut Iran’s electricity export to Herat province.
Iran has dispatched firefighting and military forces to the explosion-hit area.
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MR