Information Minister Lai Mohammed says the government has reservations about the new video apparently showing 15 of the Chibok girls alive.
He said that another such video had appeared last July but when officials had tried to pursue the matter, it led nowhere.
“It is strange that it is at a time when we have recorded such a comprehensive success against the insurgency that some groups are now coming up with these videos,” the minister said.
Last week another group said they would release 10 of the girls for $1m and the government had to be careful they were not being exploited, he said.
“Having said that we are ready to explore all avenues that will lead to the release of these girls.”