One night of heavy rains has left the IT city of India Bengaluru crippled. Poisonous froth from Bellandur Lake has overflown threatening the lives of the residents. Several Bangaloreans are literally marooned in their own homes. In several localities, roads submerged and traffic came to a standstill with water overflowing on the roads. Residents are blaming the civic officials for allowing encroachments in the city.