NEW DELHI, India (CNN) -- At least 75 people were killed and 53 injured when rising floodwaters reportedly swept two crowded buses away Friday in the southern Indian state of Tamil Nadu, according to Indian media and authorities.In the first incident, in Tanjavure district, official Veera Shanmugha Moni said Saturday that 49 bodies had been recovered and 36 people were injured.In the second incident, in Ramnathapuram, officials told CNN 27 people were dead and 17 people had been taken to hospitals. At least 73 people were believed to be on board, authorities said, and many are unaccounted for.Heavy rains have plagued Tamil Nadu for days, according to media reports.CNN's Prithvi Banerji contributed to this report