RIYADH, 14 January — Two infant brothers were found dead in a sewage tank in Unaiza in the Qassim province on Saturday after they had been missing for three days.

Police, who were informed of the location of the dead bodies by an anonymous caller, strongly suspect that the brothers were murdered and have launched a formal investigation.

The bodies of three-year-old Naif and two-year-old Othman were found in the sewage tank at their uncle’s house after the water was pumped out, said Maj. Gen. Khaled Al-Tayyib, director of Qassim police, who is leading the investigation team.

Al-Tayyib expressed the hope that the mystery surrounding the deaths would be solved soon.

Othman, second child of Hadeeb ibn Eid Al-Motairy from his second wife, was reported missing on Tuesday. Police immediately started scouring the area with the help of local residents.

Three days later, with no sign of Othman, his parents reported that their eldest son, Naif, had also gone missing that morning. The second disappearance made the police suspect a criminal motive. Police interrogated a number of people, including relatives of the children.

Finally, Saturday morning they retrieved the bodies from a tank belonging to the children’s uncle, following the tip-off.