Queen Of Hearts

The Queen of Hearts has lost her tarts!  She is sure that knaves who have not eaten the tarts will tell the truth and that any guilty knaves will tell lies  When questioned, the knaves answer as follows:

Knave 1 – “One of us ate them”

Knave 2 – “Two of us ate them”

Knave 3 – “Three of us ate them”

Knave 4 – “Four of us ate them”

Knave 5 – “All five of us ate them”

Which knaves ate the tarts?