At least 25 people, including a two-year-old child, have been killed in a bomb blast which ripped through a government office in northern Nigeria.
The bombing is a suspected suicide attack, likely to be blamed on the Boko Haram Islamist group.
The explosion occurred in the town of Zaria as primary-school teachers and public-sector workers were queueing for identity checks, according to witnesses.
Kaduna state governor Nasir El-Rufai says the attack killed 25 people and injured 32 others.
Also on Tuesday, a female suicide bomber blew herself up near a military checkpoint in restive northeastern Borno state, killing four people.
And on Monday, a girl believed to be aged just 13 was killed when explosives strapped to her body detonated near a major mosque in Kano city.
That bombing followed a twin attack on a mosque and restaurant in the central city of Jos on Sunday, which left 44 people dead, and a suicide bomb attack on a church in Potiskum that killed five.
Boko Haram has increased the intensity and frequency of its attacks on civilians since President Muhammadu Buhari came to power on May 29 vowing to crush the rebels.