A man with a knife has barricaded himself on a city bus in Asheville, according to a tweet from the Asheville Police Department.Police posted on Twitter about the incident Wednesday about 11:15 a.m., saying a crisis negotiation team was at the scene in the 1600 block of Hendersonville Road.Police later confirmed the incident began about 10 a.m.Police with the Alcoholic Beverage Commission tried to serve