An official from Niger blamed Nigeria's Air Force, which denied the allegations of having carried out the bombing.
"It's not to my knowledge and there has not been any report from our people of such an incident," Air Commodore Dele Alonge, a spokesman for Nigeria's air force, told AFP.
Also on Wednesday, eight civilians were killed by Boko Haram fighters in a village in northern Cameroon, where they set houses on fire and stole around 70 cattle.
Boko Haram is a militant group, which aims at establishing an Islamic state in northern Nigeria. Large swathes of land in the Borno State, as well as in neighboring Adamawa and Yobe are believed to be under control of the Islamists. The Boko Haram insurgency has left over 13,000 people dead since 2009.