Hunt, United States (AFP)-More than 160 people remain unaccounted for after devastating floods in Texas, the state governor said Tuesday, marking a dramatic increase in the number of missing from a tragedy that has so far claimed 109 lives.

Four days after flash floods roared through several Texas counties, some in the middle of the night, hopes of finding survivors were fading — and Governor Greg Abbott warned that the list of those unaccounted for could yet rise as the grim search continues.

“Just in the Kerr County area alone, there are 161 people who are known to be missing,” he told reporters.

“There very likely could be more added to that list,” he said, adding that the figure was based on people reported as unaccounted for by friends, relatives and neighbors.

Kerr County, part of a central Texas region known as “Flash Flood Alley,” suffered the most damage, with at least 94 fatalities.

That includes at least 27 girls and counselors who were staying at a youth summer camp on the Guadalupe River when it burst its banks as the Fourth of July holiday began in the early hours of Friday.

Torrents of water swept through the camp, scouring cabins as hundreds of people slept.

Five campers and one counselor were still missing as of Tuesday evening, according to Abbot, as well as another child not associated with the camp.

“There’s nothing more important in our hearts and minds than the people of this community, especially those who are still lost,” Abbot said.

Elsewhere in the state, there have been at least 15 fatalities recorded so far, the governor added.

Ben Baker with the Texas Game Wardens said search and rescue efforts involving helicopters, drones and dogs were extremely difficult because of the water and mud.

“When we’re trying to make these recoveries, these large piles can be very obstructive, and to get in deep into these piles, it’s very hazardous,” Baker said.

“It’s extremely treacherous, time-consuming. It’s dirty work, the water is still there.”