Kano - An explosion hit a busy bus station in northern Nigeria's largest city Kano on Tuesday, witnesses said, just hours after another terminus was hit in the country's northeast.
The explosion happened at about 3:40 pm (1540 GMT) but there was no immediate indication of casualties and the scene had been cordoned off.
"I was attending to customers when I heard a loud explosion that shook the building. We rushed outside and we saw plumes of black smoke coming from the Kano Line Station," said one local shopkeeper.
An orange seller inside the bus station confirmed his account.
"We rushed outside and we saw plumes of black smoke coming from the Kano Line Station," the shopkeeper said.
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"People and buses were rushing out of the bus station. One bus was splattered with blood and human flesh."
There was no immediate indication of casualties but there were fears of a heavy death toll, given that the bus station is normally packed with commuters and travellers.
The police had cordoned off the scene.
Kano is north Nigeria's largest city and has been among the places hardest hit by Boko Haram's six-year insurgency, which is aiming to create a hardline Islamic state in the region.
One of the worst strikes was a November 29 attack on worshippers attending Friday prayers at the city's central mosque, which killed at least 120 people and injured 270 others.
Last July, Kano was attacked by female bombers four times in a week, while in January 2012, Boko Haram gunmen rampaged across the city, killing at least 185.