Search efforts continue for a fourth day as a girls' summer camp confirms 27 children and staff are dead, with 10 campers and one counsellor unaccounted for.

At least 81 people, including more than two dozen children, died in the torrential downpour. Dozens more were still missing three days later.

The death toll from the devastating floods across central Texas surpassed 90 as dozens of people remain missing. In Kerr County, at least 48 adults and 27 children died, according to officials.