OwerriPolice have located the camp holding kidnapped corps members.
Nigeria sends graduates by road to compulsory service, and gunmen took about 19 of them Thursday.
Commissioner Audu Bosso said drones found the camp Friday, but intelligence indicates abductors mined it with improvised explosive devices.
Police say they rescued 10 victims at the scene and are still verifying how many remain captive.
Police will advance with bulldozers and armoured vehicles, Bosso said, but gave no date.
How each outlet framed it
- Premium Times Nigeria
- details tactical restraint due to intelligence of IED deployment at hostage site, with drone reconnaissance locating camp
Sources: Premium Times Nigeria