NEW : Building company CEO , his son , believed to be onboard , business says . NTSB investigators on scene , waiting until scene is safe to enter . Charles Muttillo , vice president of Morley Builders of Santa Monica , issued a statement Monday saying the company 's president and CEO and his son were believed to be on the plane . Number of victims unknown ; jet could carry seven to nine people . Comment:
NEW : Building company CEO , his son , believed to be onboard , business says . NTSB investigators on scene , waiting until scene is safe to enter . Number of victims unknown ; jet could carry seven to nine people . Comment: