At least 20 people were killed in a bomb blast in the city of Zaria, northern Nigeria, on Tuesday, a regional governor said.

“I am sad that a terrorist bomb attack just killed 20 people in Sabon Gari Zaria,” Nasir Ahmad El-Rufai, the governor of Kaduna state, wrote on his Twitter account.

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The blast happened at about 9:00 am (0800 GMT) as primary school teachers and public sector staff underwent screening at government offices in the city, according to witnesses.

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There was no immediate claim of responsibility but Boko Haram Islamists will be the main suspects, as they have carried out a wave of similar attacks in the past.

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Details later…