A paratransit bus driver intentionally rammed a Hells Angels biker on Interstate 580, and then dragged him about a mile, killing him, a CHP spokesman said. The biker, who has not been identified, was traveling eastbound on I-580 in San Leandro near Grand Avenue with a small group of Hells Angels members before 4 p.m. when an altercation began, said CHP Sgt. Trent Cross. After being hit, the motorcyclist and his bike were dragged for about a mile, said San Leandro police Lt. Greg Lemmon. Eventually, the biker was released from under the East Bay Paratransit bus, but the driver kept dragging the motorcycle, which was wedged underneath the front grill, until the vehicle stopped on the shoulder just east of the 150th Avenue onramp. The Hells Angels biker was flown to Eden Medical Center in Castro Valley, where he was pronounced dead, Lemmon said. The bus driver has been arrested, Lemmon said. Police are interviewing four witnesses who saw the incident. "The preliminary information they are providing was that it wasn't an accident, it was an intentional ramming," Lemmon said. All eastbound lanes were closed from Grand Avenue to 150th Avenue so police could conduct a homicide investigation over a large swath of freeway, Cross said. The lanes were expected to remain closed until 10 or 11 p.m., he said, and there were significant traffic delays in the area. An East Bay Paratransit manager referred calls to First Transit, a Advertisement contract agency that operates the bus. The First Transit representative did not return calls. No passengers were on board the bus during the collision, said San Leandro police Sgt. Doug Calcagno. The paratransit bus provides door-to-door service for people unable to ride regular public transit because of disabilities. It has been a tragic autumn for the Hells Angels motorcycle club. San Jose chapter President Jeffrey "Jethro" Pettigrew was killed outside a Nevada casino last month. At his packed funeral Oct. 15, Steve Tausan, a 52-year-old Hells Angels enforcer and friend of Pettigrew's, was shot dead.