The city is reeling under a heat wave, having registered the hottest March day since 1956. This has meant a rise in the number of forest fires at the Sanjay Gandhi National Park (SGNP), spread over 104 sq km. Since January 2011, it has witnessed around 25 such cases. The biggest fire incident of the season took place last week when an area of around 8,000 sq ft was destroyed, causing immense damage to the flora and fauna of the national park.