At least 161 are still unaccounted for after the July Fourth floods that saw the waters of the Guadalupe rise to historic levels in Central Texas, officials with Kerr County said Friday. Authorities have confirmed 103 deaths, 36 of whom are children.

The heavy showers have caused Flash Flood Warnings across Central Texas and prompted officials to close low-water crossings, roads and parks.

Kerr County officials say death toll has risen to 96 due to the Hill Country floods, including 60 adults and 36 children.

Texas officials are being questioned about warning systems ahead of the deadly floods. As NBC News' Priscilla Thompson reports, Kerr County doesn't have a county-wide siren warning system in place.

As search and recovery efforts continue following the deadly floods, NWS warns of isolated flash floods due to the possibility of heavy rain this weekend.⛈️

The alert says there is a high chance the Guadalupe River will flood on Sunday. They’re asking for all people, equipment and vehicles to move away from the river immediately. They also said all volunteer operations are suspended until further notice, stating “safety of lives is the highest priority.”

A memorial service was held in Kerr County, Texas on Friday to honor the victims and those still missing from flooding that recently struck the region.

Kerr County and the Upper Guadalupe River Authority have tried several times to get funding to upgrade flood alerts on the river, dating back to 2016.

Over 12,000 volunteers have already assisted in Kerr County, according to the Texas Division of Emergency Management.