12:40 PM PT -- Venezuelan authorities believe Valbuena and Castillo may have been victims of robbers who throw rocks onto roads to cause cars to crash and then steal from people inside the vehicle.
Yaracuy governor Julio León Heredia announced 4 suspects have been arrested after they were found with the players' belongings.
MLB infielders Luis Valbuena and Jose Castillo were killed in a car crash in Venezuela on Thursday ... after a car they were riding in veered off the road.
According to local reports .