A suspected suicide bomber targeted civil servants at a government building in Zaria city, killing 25 and wounding 32. Boko Haram, which often targets northern Nigeria, has stepped up attacks since President Buhari took office in May. The group has not yet commented on the latest attack, which came a day after police chief Solomon Arase announced new measures to curb the rise in bombings. The measures include banning street trading and hawking in Abuja, and strengthening security at all mosques and churches countrywide. Witnesses in Zaria said people including primary school teachers had been queuing up seeking employment under Mr Buhari's administration when the bomb was detonated. Kaduna state governor Nasir El-Rufa'i said citizens were to be vigilant and avoid crowded places like markets, mosques, churches and motor parks in the next few weeks.