Five killed in Boko Haram bomb attack in Niger - sources
One source said the blast was caused by a female suicide bomber, but the second source said it was a car bomb.
The attack on Diffa is the third in four days as militants from the Nigeria-based jihadist sect step up cross-border attacks.
(Reporting by Abdoulaye Massalaki; Writing by Emma Farge; Editing by Dominic Evans)