According to Meteorology Department sources red rain fell heavily in these areas and the reason has not been found yet. Red rain in Sewanagala and Manampitiya left red frost on the ground. This is the first time red rain was witnessed in Sri Lanka. The Health Ministry Secretary informed Medical Research Institute (MRI) Director Dr Anil Samaranayake to conduct a study to ascertain the reasons for red rain by taking water samples from Monaragala and Polonnaruwa. Increase in the acidity of the air and sand storms are the usual reasons for red rain. However, there are no sand storms in Sri Lanka. India had red rain last year and Indian scientists discovered a variety of micro organisms as a reason for the rains. Since the micro organisms had no DNA, they guessed it had to be a strange phenomenon. The MRI is carrying out research to find the exact reason for red rain in Sri Lanka. – Daily News.
This is a microscopic view of the mysterious "red rain" that fell in Sri Lanka in 2012.
Scientists still can't explain its makeup -- or what turned it red. It's not algae, not blood...but appears to be a replicating organism with no DNA. So is it alien? All researchers know for now is that it's unexplainable.
During the search for a rational explanation, investigators find evidence of strange living cells with no earthly comparison.
The Haunted Red Rain
The first well-documented reports of red rain came from the southern state of India, Kerala in the year 2001 though some reference of such incident have been recovered from the year 1818. After 2001, there had been reports of red rain in Kerala in 2011 and 2012. The unusually phenomenon also occurred in Sri Lanka in 2012 as well.
Hindu Mythology and Red rain
As per the Hindu culture, the red rain signals the wave of destruction and woes, the God punishes those who have sinned. The killing of innocent also leads to red rain, following are further details about incident; 3
Source 1, 2, 3