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
In a statement on Wednesday, the Council reiterated its categorical rejection of such terrorist attacks and violence, which contradict the teachings of all religions as well as international laws and norms.
The new weekly work system introduced by the Government of Sharjah has improved the productivity, satisfaction rate and happiness of the employees by almost 90 per cent.
"For the last several months we've been testing a new way to tweet together using CoTweets. We're sad to say that the current experiment is coming to an end," the platform said on its help centre page.
It was at the start of an FA Cup semifinal between Liverpool and Nottingham Forest in 1989 that a crush led to 97 fans dying and almost 800 fans being hurt. The game at the Hillsborough Stadium in Sheffield was abandoned after just a few minutes.