Five days after deadly floods struck central Texas, search and rescue teams are continuing to probe debris for those still missing.

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

Because if you evacuate too late, you then risk putting buses or cars or vehicles or campers on roads into low-water areas trying to get them out, which then can make it even more challenging. Because these flash floods happen very quickly.