Thick black smoke billows from the explosion site.
A gas tanker exploded on Saturday at a customs post in Afghanistan on the Iranian border, local Afghan officials said, adding that scores of officials were assessing the damage caused by the massive fire.
A video circulating on social media showed thick black smoke billowing from a huge ball of fire.
There were no immediate reports of casualties.
Iranian media quoted an Iranian customs spokesman in the northeastern province of Khorasan as saying the blast had occurred around noon at the Islam Qala border customs post in Afghanistan.
On the other hand, Iran's President Hassan Rouhani warned on Saturday of a Covid-19 "fourth wave" as cases rise in certain areas of the Middle Eastern country hardest hit by the pandemic.
"This is a warning for all of us," Rouhani said in televised remarks.
He said some cities in the southwestern province of Khuzestan were now "red" -- the highest on Iran's colour-coded risk level -- after weeks of low alert levels across the country.
"This means the beginning of moving towards the fourth wave. We all have to be vigilant to prevent this," Rouhani added.
The country of more than 80 million people has lost close to 59,000 lives out of more than 1.5 million cases of Covid infection.
Iran has officially registered less than 7,000 daily infections since late December, but the number has crossed this level since early February.
At least seven people were killed in an attack on the Afghan communications ministry in central Kabul on Saturday, breaking months of relative calm in the capital and underlining the continued security threats despite efforts to open peace talks with the Taliban.
Four Pakistani soldiers have been killed by an improvised explosive device in a tribal region along the Afghan border, Prime Minister Imran Khan said on Saturday.
An Afghan official says an explosion at a coal mine in the northern province of Samangan has killed at least seven miners. Hashim Bayan, a spokesman for the provincial police
The management has officially welcomed devotees to the 70,000 square foot premises by monumentally lighting a lantern together to celebrate the opening. Over 200 dignitaries, ambassadors and local community leaders attended the celebration.
Vishal Ranjan, registrar with the institute, confirmed the four deaths and that the rescue operation "has been stopped for now because of heavy rainfall and snowfall in the region".
The vehicle was travelling along a treacherous mountain highway in Uttarakhand state when it careened over an edge and plunged at least 500 metres (1,640 feet) with around 45 people onboard.
The overcrowded stadium in Malang in Indonesia's East Java province descended into chaos after police fired tear gas to disperse agitated fans who had poured on to the pitch at the end of the match. It was one of the world's worst stadium disasters.