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Sparrows entering blue tit nest box and killing chicks

We have had blue tits in one of our nesting boxes and the parents have busily been feeding them. Today we found a pair of sparrows entering the box and have pecked the young and killed them and then proceeded to throw them out of the box. Blue tits have been back but now disappeared.We looked in the box to find the dead pecked chicks some were quite big.Now the sparrows have taken up residence in the box to nest ? don't know. Has anyone heard or encountered this behaviour before.We would love to find out something not a  a very nice day today.