The Canada Border Services Agency says it is aware of an incident involving suspicious passengers on an Air Canada flight from Venezuela to Toronto.

A media report says the flight's captain found five extra people on board with fake tickets. The four Iranians and one Afghan had no visas to enter Canada.

They were reportedly all forced off the plane before it left the Venezuelan capital, Caracas.

Air Canada did not provide details except to say the flight was delayed five hours because of "immigration issues."

"Air Canada and the Venezuelan authorities are still investigating this matter so we have no further information to offer at this time," the airline said in an email to CBC News.