Police Public Relations Officer in the state, Kennedy Idirisu, confirmed the killing to the News Agency of Nigeria (NAN), in Lafia on Tuesday.
Idirisu said the victims were returning from their mining site in a company truck at about 4p.m. when the assailants shot them.
Idirisu said a Chinese, a police escort and two others were killed during the ambush while another Chinese survived with bullet wound and was being treated in a hospital.
He said the Commissioner of Police, Abubakar Sadiq-Bello had deployed officers to the area to work in collaboration with other security agencies as well as the vigilantes to fish out the perpetrators of the heinous crime.