Gunmen, on Wednesday abducted an American and a Canadian in Kworo-jere area of Kagarko Local government, Kaduna state.
The victims were said to have been ambushed on their way back from Kaura and Kafanchana.
The gunmen also killed two of the policemen attached to the foreign nationals.
The public relations officer for the Kaduna state police command, Murktar Aliyu, confirmed news of the attack but said that the command has intensified efforts to bring the perpetrators to book.