Two policemen were on Wednesday killed and two foreigners, an American, and a Canadian, kidnapped in Kaduna State by unknown gunmen.
According to the police spokesman, the armed kidnappers ambushed the vehicle coveying the two foreigners along the Jere-Kargao Road on Tuesday night.
The group, travelling in two vehicles, was reportedly attacked on their way from Kaduna to the capital Abuja, about two hours away.
"The two police escorts attached to them engaged the kidnappers in a fierce gun battle, which resulted in the unfortunate death of the two police officers", Aliyu said.
Kidnappings are rife in Nigeria, where domestic security is weak, though they overwhelmingly target other Nigerians.
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The incident occurred at about 9 a.m. near Pauline Johnson Public School in Toronto's east end. Canada's Prime Minister, Justin Trudeau, tweeted his support for Kwalah on Friday.
A spokesman for the United States Embassy in Nigeria declined to comment.
He said the Command had since swung into action as it had deployed its anti-kidnap unit and assured that the abductors would be brought to book.
Parts of the Abuja-Kaduna road have been target locations for kidnappers.
DSP Mukhtar Aliyu confirmed that the foreign nationals included two Canadians and two Americans.