India on Wednesday deployed troops to Tamil Nadu and closed the main airport after heavy rains exacerbated weeks of flooding that have killed nearly 200 people in the southern coastal state. Thousands of passengers were left stranded at the international airport in the state capital Chennai after flooding on the runway forced the cancellation of dozens of flights. Authorities said thousands of rescuers carrying diving equipment, inflatable boats and medical equipment were also battling to evacuate victims across the flooded state.