There was a tropical cyclone (as hurricanes are known in that part of the world) that slammed into the Ganges River Delta region of what is now Bangladesh in 1970. It's been said the winds, heavy rain and storm surge from that storm may have killed one million people.
This is why I am concerned that Bangladesh may be seriously underreporting its casualty toll from this tsunami. There are quite a lot of Bangladeshis living in the Ganges River Delta area and that tsunami could have destroyed quite a lot of villages there, resulting in a death toll that could reach into the tens of thousands. 
