This question of the 'bathtub massacres' has been debated at great length on a number of threads here, e.g.:
http://69.16.253.89/cyprus9643-50.html
Expatkiwi may not be aware of this, but there was a lot of debate about this event the Turkish Cypriot press a couple of years ago. It seems that the photographer who took the famous picture has now admitted that the babies were moved into the bathtub and carefully positioned to produce a good propaganda photograph. The precise circumstances of their death, to my mind, remains a mystery. Whoever killed these young children committed a heinous act.
If you want to ask about a documented event, why not instead raise the killing of a Turkish Cypriot family of seven in their home in Liveras in March 1964? This event is described in detail on pages 225-228 of Martin Packard's book "Getting It Wrong", which is an eyewitness account of the time he spent on the island as a peacekeeper.