Bats found dead in mysterious circumstances across India

Amid the Coronavirus (Covid-19) pandemic, a serious and troubling report has surfaced. Hundreds of bats are being found dead across India in multiple states. The first such incident was reported in Madhya Pradesh's Singrauli. Here, multiple bats were found dead in a mango orchard.

The next instance was reported from Bihar's Bhojpur which has instilled fear in people. What is the reason for these mass deaths?