R.I.P Pigeons

Remember the pigeons that lived on the balcony? I took a picture of the baby pigeons every couple of days documenting how fast they grow. It's 3am and I was asleep on the couch in the living room when Ali -my housemate and cousin- woke me up saying there was a big comotion on the balcony and when he walked to the door to check it out a big bird flew and hit the rail before flying off. So I got up, and what I saw was very strange. One of the baby pigeons was not there, and the other one was dead in the nest! None of the parent pigeons were around, but there were ALOT of white feathers on the balcony - one of the parent pigeons was white -
So what flies around at 3am in the morning? My guess is that it was an owl, maybe an eagle? but I do not think eagles fly at night. I am almost convinced it was an owl.