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.

Emergency responders continued to search for missing individuals including at least 10 girls who were attending a summer camp on the banks of the Guadalupe River.

For the first time since the storms began pounding Texas, Gov. Greg Abbott said there were 41 people confirmed to be unaccounted for across the state and more could be missing.