At least seven people have been killed and another 30 injured in a blast that occurred in Kantin Kwari textile market in the city of Kano, Nigeria's Kano state, according to reports.
It is believed that two women carried out a suicide attack, hitting a vehicle loading area.
It is not yet clear who was behind the blast, but responsibility is likely to fall on terror group Boko Haram.
Bodies of the dead are being evacuated by the police who have cordoned off the market, while injured people are being taken to the Mohammed General Hospital, local reports said.
Trader Nura Sadiq told AFP news agency: "I heard a huge sound coming from the back of my shop along Unity Road. I just closed the shop and tried to leave because it's not safe."
In a conflicting report about the death toll, Reuters stated that four people were killed in the assault and seven injured.
Boko Haram's attacks often target Kano, where in December the terrorists bombed a mosque during Friday prayers, killing at least 200 people in the blast and subsequent shooting massacre.
Shortly after, some 150 people died in a raid carried in Nigeria's northern city of Damatur, Yobe State.
Boko Haram's fresh attacks came weeks after the Nigerian government announced it had reached a ceasefire with the terror group.
Shekau released a video in which he called the claims of a truce "lies".
"We did not negotiate with anyone," he said. "It's a lie. It's a lie. We will not negotiate. What is our business with negotiation? Allah said we should not."