baby birds flew away

Ashy prinia made her nest in my garden and she laid two egg. the 13th day they hatched. now today it was their 11th day as chick and they were healthier. today morning i saw they are no babies in their nest and muma prinia is still chirping here and there in my garden area. not sure she is searching her babies. is there any possibility that babies might have flew away from their nest without hinting their parents. it is difficult to identify if any predator took away.. because there were no traces of their feathers and also the nest is fine clean.

i just hope there are safe.