11.   In San Diego, the police said the bodies they discovered bore signs of neither struggle nor trauma, an absence that further deepened the mystery of the deaths.

12.   Listening to a boxful of recordings of his works newly reissued by Deutsche Grammophon merely deepens the mystery.

13.   Sanders was never one to publicly explain himself, and that only deepened the mystery of his departure.

14.   The disclosure deepened the mystery over the alleged bombing plots, and officials said Tuesday night that they were uncertain what to make of the information.

15.   The documents may only deepen the mystery over the fate of Americans still considered missing from the Korean War.

16.   The new analysis deepens the mystery of how these apparently separate branches of the human family tree interacted.

17.   The new study deepens the mystery of the ancient ice ages.

18.   The recovery of the cash deepened the mystery surrounding an already curious case.

19.   While that report raised hopes, it also deepened the mystery.