"A special clean-up operation from November 26 to 28" against Boko Haram fighters in the border area with Nigeria "neutralised more than 100 jihadists", Defence Minister Joseph Beti Assomo said in a statement broadcast on national radio.
The sweep enabled troops "to release almost 900 hostages, seize a large stock of arms and munitions as well as black-and-white Islamic State flags", the statement added, without providing details on the identities of those freed.
Some security sources reached by telephone confirmed that the raid took place but were unable to confirm the figures released in the government statement.