The policemen were said to have been attached to the two foreign nationals to provide them protection.
Global Affairs Canada spokesman John Babcock said Canadian officials were aware that two citizens were reportedly abducted.
Aliyu reported earlier in the day that only two people were kidnapped, one American and one Canadian.
"Consular officials in Nigeria are in contact with local authorities to gather additional information", Babcock said.
The Kaduna State Police Command has confirmed the abduction of four foreign nationals on Kwoi-Jere road in Kagarko local government area of Kaduna State in northern Nigeria.The Police Public Relations Officer (PPRO), Mr. Mukhtar Aliyu, confirmed on Wednesday that the foreign nationals included two Canadians and two Americans.
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Though it was known the jewels had been taken to the castle for safekeeping, details had not been widely discussed. "It's the sort of, I suppose, the beginning of one's life really as a sovereign", the 91-year-old monarch said .
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Mecklenburg authorities revealed that a distressed mother critically injured her children before committing suicide . Details beyond that - about exactly what happened in the hours before she headed to the bridge - are not yet clear.
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The U.S. lender, which has total assets of $1.8 trillion, said revenue increased by 1 percent year on year, to $17.3 billion. The bank already plans to return at least $60 billion worth of capital to investors through stock buybacks and dividends.
A source in Kafanchan said the team of six had gone to Kafanchan and Kaura for inspection of a project and were waylaid by a group of bandits who stopped their vehicles, captured the four and drove into the bushes. Two German archaeologists were seized at gunpoint past year less than 100 kilometres northeast of Abuja and later freed unharmed.
There has been an increased spate of kidnappings in Nigeria, where both Nigerians and foreigners have been targeted.
One of the hostages was killed while the three other hostages were later released.
Safety on the Kaduna-Abuja road came under intense scrutiny previous year when the federal government announced the closure of the capital's only airport for essential runway repairs.