KUWAIT CITY: Fifteen workers with an oil drilling company were killed in a head-on collision between two buses in southern Kuwait on Sunday, the fire department said. Fire department spokesman Col. Khalil Al-Amir told AFP that the victims, mostly Asian expats, were employees of Burgan Drilling, a private subcontractor. Four other workers were hospitalized, some in critical condition, Amir said, without giving the nationalities of the casualties.