Twenty people have been killed in a traffic accident in upstate New York, involving a limousine carrying a wedding party. <br /> The limousine crashed into a parked vehicle and two pedestrians after it sped through an intersection over the weekend. <br />All 18 people in the limo and the two pedestrians were killed.<br />The cause of the crash is still unclear, but a National Transportation Safety Board team is investigating the scene.<br />The NTSB said Saturday's incident was the deadliest transportation accident in the U.S. since a 2009 plane crash in Buffalo that killed 49 people. <br />
