Some 180 people were killed in Nigeria last month after a coordinated strike on the city of Kano. But what happened afterwards is now coming under scrutiny.
Security forces arrested more than 150 suspects from the militant Islamist group Boko Haram, who claimed responsibility for the attacks. But there was also a night time raid on a house near the centre of Kano. A married couple have since disappeared.
The BBC's Mark Lobel reports from Kano.
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