Who is the thief ?

Who is the Thief ?

Three people met at the corner of a street.
They all are dressed like cops,
So they don't know who the thief is.
the cops will always tell the truth and
the thief will tell the truth too
to make himself appear like a good cop.

If their names are Silva, Angelina & Rex
and they said this :

Silva : "Rex is not the thief."
Angelina : "One of you both is the thief!"
Rex : "I am not the thief."

Who is the thief ?

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Since all the three only speak the truth,
Silva is the thief.