KERRVILLE, Texas — With more rain on the way, the risk of life-threatening flooding was still high in central Texas on Monday even as crews search urgently for the missing following a holiday weekend deluge that killed at least 82 people, including children at summer camps. Officials said the death toll was sure to rise.

Search teams plodded through mud-laden riverbanks and flew aircraft over the flood-stricken landscape of central Texas for a fourth day on Monday, looking for dozens of people still missing from a disaster that has claimed at least 78 lives.

The disaster, triggered by unprecedented rainfall early Friday morning, has claimed at least 78 lives, with Kerrville alone accounting for 68 deaths, including 28 children.