Reports from Nigeria say at least 80 people have been abducted by gunmen in Kaduna.
Road transport union officials say the people were seized as they travelled on a major highway linking northern Nigeria with the south.
They added that the gunmen stopped several vehicles, herded dozens of travellers into a nearby bush and abandoned the cars.
The police spokesman told the BBC that there have been three kidnappings on that road recently, without giving details of times or numbers.
But, the spokesman refuted reports of “mass abductions”.
On Monday, the Nigerian army chief visited the area to improve security following a spate of attacks by armed bandits.
Gunmen killed more than 70 people in a village in the area last week.