About 670 people — many of whom are feared to be children — are assumed dead after a landslide deluged several villages in Papua New Guinea on Friday, according to the U.N. International Organization for Migration.

Local officials extrapolated the estimate based on the number of homes — more than 150 — that were buried in the northern Enga province, said Serhan Aktoprak, the chief of the U.N. migration agency’s mission to the Pacific nation north of Australia.