"We had an explosion outside the motor park (bus station) this evening around 8:30 pm local time (0100 IST today) which killed five people and injured 15 others," said Muhammad Garkuwa, a drivers' union official.
"The explosion was from an explosive left by a woman in her handbag beside a bus waiting to convey passengers to Jos," he said in an account supported by a nearby food seller.
The attack yesterday is the latest in a string of similar explosions against so-called "soft targets" such as busy bus stations and crowded markets in the restive northeast, which has been hit for the last six years by Boko Haram Islamists.
Since then, the group has reverted to guerrilla tactics, including suicide bombings and attacks on civilians in urban centres.
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Garkuwa said he loaded the casualties into a vehicle while Yusuf Darazo, who sells food near the bus station, said the female suspect left her bag after being told the bus's destination.
"No-one suspected her. People around assumed she was making calls before the bus filled up," he said.
"As she was talking in the phone she moved away from the bus towards a row of kiosks, as if she wanted to buy something, leaving her bag where she was standing.