At least 161 people remain missing in Kerr County, Texas, as authorities and volunteers search the Guadalupe River for victims.

Texas Gov. Greg Abbott says more than 160 people are believed to be still missing days after flash floods killed more than 100 people across central Texas

Experts say there was a number of factors that contributed to the tragedy including the extreme weather, the location of the holiday homes and timing. There was a large supply of moisture in the atmosphere from a tropical storm that had caused flooding in Mexico and then tracked north as it died out.