Hukumomin na Saudiya har ila yau na ci gaba da binciken wani harin kunar bakin wake da aka kai a wani masallacin ‘yan Shi’a a gabashin birnin Qatif, inda ministan cikin gidan ya ce an gano wasu sassan jikin mutane uku, amma ba a gane ko su wanenene ba.