The Kansas Highway Patrol continues to investigate a motor home crash that killed five members of a southern Minnesota family and injured 13 others. On Wednesday authorities said they have yet to determine what caused the April 1st accident, but they still have to download some computer data from the vehicle that could yield more information. The crash occurred on Interstate 35 when a recreational vehicle carrying 18 people hit a guardrail and a concrete bridge rail near the Kansas community of Williamsburg. Five members of the Kerber family from Jordan and New Prague, ages 10 through 25, died in the crash. Several others were injured. Two remain in critical condition. Authorities say that witnesses still need to be interviewed, including some of the injured.