At least four people have been killed and a shop destroyed in an explosion near a primary school in the northern Nigerian city of Kano, police say.
Part of the school’s roof has also been blown off by the impact of the blast.
An investigation is under way police say, but initial reports indicate it was caused by a gas cylinder from a welding shop, which rules out an attack.
Soon after the explosion, emergency services and security forces rushed to the scene in Sabon Gari neighbourhood.
The authorities say there were no schoolchildren among the casualties.
The explosion has caused a lot of tension and panic across the commercial city.
Kano is the most populous city in northern Nigeria.
For several years, it has been largely spared from the extremist group Boko Haram and its offshoot, the Islamic State West Africa Province, as well as armed kidnapping gangs behind deadly violence in the region.
But nearly a decade ago a massive bomb attack by Boko Haram had killed more than 100 people in a mosque in the city.