Texas officials say private drones are interfering with flood rescue. This isn't the first time personal drones have caused issues during emergencies.

The Memphis Fire Department team, called Canine Search Team—Human Remains Detection (CST-HRD), was deployed in direct response to a formal request for aid through the Emergency Management Assistance Compact (EMAC), a mutual aid system that enables states to share resources during times of disaster, according to TEMA.

Local officials have faced angry questions about whether they could have warned people of dangerous flash floods in Texas Hill Country sooner. Rescue teams from neighboring states and Mexico have joined local efforts to search for survivors,