Canadian officials have banned most carry-on luggage for US-bound passengers following a failed Christmas Day plot to blow up a Detroit-bound airliner. Transport Canada has said that passengers may only carry medical devices, small purses, cameras, laptop computers, canes, walkers, diaper bags, musical instruments and bags containing life-sustaining items. Travellers headed for the United States have been allowed to carry on only one bag since Saturday.A 23-year-old Nigerian Umar Farouk Abdulmutallab allegedly attempted to bring down a Northwest Airlines flight as it prepared to land in Detroit on Friday.Meanwhile, the US State Department has said the information provided by the father of Abdulmutallab was insufficient to revoke the terror-suspect's visa or to put him on the no-fly list. State Department spokesman Ian Kelly told reporters on Monday that Umar’s father had gone to the American Embassy in Abuja on November 19 to express concerns about his son. However, Kelly did not divulge any details of the concerns raised by Mutallab, an eminent Nigerian banker, about his son. However, a Nigerian daily said that Mutallab had reported the suspected terrorist tendencies of his son to the US Embassy.