Ahead of Kali Puja, Diwali and Chhath Puja, flying sky lanterns or ‘phanush’ or releasing hot-air balloons without prior permission or a licence from the fire services department could invite legal action, the state govt has warned on Thursday. Ranchi Kali Puja safety measures include secure wiring, fire extinguishers, emergency exits, crowd volunteers and intensified police patrols.