A security scare grounded some 20 flights and about 2,000 passengers for several hours on Friday between Vancouver and the United States, airport officials said. Most flights were resumed late in the day, said Ali Hounsell, spokeswoman with the Vancouver International Airport. The scare was triggered by a suspicious envelope containing a white powdered substance which raised alarms among U.S. officials and prompted the Canadian airport to stop loading passengers from Vancouver to the U.S. early Friday afternoon. Domestic and overseas flights from the airport were not suspended. Full Story