The death toll in Kerr County crept up to 87 on Tuesday as search and rescue efforts continued in flood-ravaged central Texas, according to officials in the county worst hit by the disaster, which has killed more than 100 people.

Texas Governor Greg Abbott told a news briefing on Tuesday afternoon that at least 161 people are known to be missing after the deadly flooding, noting that searches will persist throughout the Guadalupe River system in the hope of locating anyone else.

A massive Texas search and cleanup effort was set to enter its fifth day Tuesday in response to Guadalupe River flooding that surged through the area on July 4.