SMYTH COUNTY, Va. -

Authorities now know what caused a serious crash in Southwest Virginia.

     Virginia State Police say a pickup truck was traveling south on route 107 around 6:30 Monday morning between Chilhowie and Saltville.  They say the pickup crossed the centerline and hit a northbound pickup head-on.

     State Police say Don Rickmon of Tannersville, Virginia.. and Jeffrey Yarber of Glade Spring are being treated for life-threatening injuries.

     Police say charges are pending.