A flash flood in Nilambur swept away nine people, killing two and leaving four missing. Three were rescued; the river rose unexpectedly, likely due.Nilambur flood, Kottapuzha River incident, flash flood Pookkottumpadam, river surge Malappuram, people swept away Nilambur, two dead four missing, river rescue operation, heavy rainfall upstream, popular river spot, social media influence, unspoiled natural beauty, river hazard warning, local tragedy Nilambur, water safety concerns, sudden river rise